Malicious PDF — malware analysis report

Static analysis result for SHA-256 af749ce4c0933f3b…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 23:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d9634535fda0da6c52b8385b005844d0 SHA-1: 3c40ff5b200564a7cb33c47338e279bf3f1f3db1 SHA-256: af749ce4c0933f3b741f9c218f18db32b5779161e673c3aeea4ceb777fdfd595
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malicious content delivery mechanism. It contains numerous links, including one to an algorithmically-generated URL and others pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to harmful sites. No scripts were extracted from this sample, but the presence of multiple external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fq3g3n83rp124mdnavvfack7hm/gamebotadasuxe.pdf In PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16092d75850dc4---88052597614.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/53742207106.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/renarexogopekaginonovetud.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/546b6c8c19dfd6bb8aee65bd372ebb7d/xokebamaxebiketugivenubet.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3889808813---26407587379.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/53608777657.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5c261920---pabizadudelalojufuvumunis.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160772399376d3---45806358646.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/2e90c18f28e47d2545f78706cf66887e/xixurikamegegare.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/pakalefifiwizozunozuj.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/787euh07t6qi6ql28lt9i97s55/26132643440.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/af053eb122862e66e016c16b63448050/34136081921.pdfIn PDF document text
    • http://technocom.pl/editor/file/39653139272.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/kurapezavusegizifepazalu.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e5f9kiq73ig2hp5phk87vuanka/bugabexobafedakidujuzeg.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0a1ee42c286f27cd42017637bd5e7d78/kixaresaguwefalezewavo.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/9068738983.pdfIn PDF document text
    • http://cocoal.com/uploads/file/degakubusuzusi.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/51092801438.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5bbaf079---retamanilonavujepenoti.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/rusavazulosogokorikefawo.pdfIn PDF document text
    • https://area5srl.it/file/48587548755.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/liwigoxor.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1b571fae---wefuwotowowom.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fd7b548945e4397a8398429cb48f6b17/79491947085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=low+globulin+and+proteinPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10680 bytes
SHA-256: fc31f43832212f7f70fa8141bb263602609e3112468082b986ec04255a3c7969
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 17692 bytes
SHA-256: b556fcdc8b7d09ac488d2e84e8a1b16593ca6a3a3ce3f3132db3316569f0f3a8