Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1a35ef855e33ac…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 00:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaffb26f9eaf48496f147e2d29d628d8 SHA-1: eedc83f24e15fd1330a708e85f0feb0081c8b6d3 SHA-256: 2e1a35ef855e33ac1af1507bbb7a2971f82e5bf32f1e6a256219b95024d1760d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the overall structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://profesniprukaz.cz/ckfinder/userfiles/files/rewejidetisapo.pdf In PDF document text
    • http://sipzip.com/userfiles/file/puzanawexesi.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/tikenukimuzudesidariwako.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/wegukakazitupujifumi.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/mopuxasuzudilumoxefejo.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/refabupupuvomemajopobovub.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/luxisuxevosa.pdfIn PDF document text
    • http://usateatop.com/_upload/files/babosaluk.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/63597871781.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/lepagitifufomif.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/kuzavi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4938057f53aa8667c75d4e65f335ab65/nekukiwapoxomuge.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/70574249673.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/15007233114.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3e6a09aa9d5dfef06380d978410b3f19/mobulobupumuvulu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pinizekidozavu.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/bewonapopofom.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/81448324357.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/netonolerazamem.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/37224898383.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86b03d9fa---nudamopefavadiza.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/61254942839.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/32911824319.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/51871874465.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/36447468373.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/6193037c815bb87af421b86759ce999a/ponetevagotex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=obb+forza+horizon+4PDF 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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 16768 bytes
SHA-256: 4b63ccc8645027dafc9be91512a9d153a4e99e34a1ba613f793099e152425ffb
font_02_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10168 bytes
SHA-256: 185afcd09471dd8cec44bb37f96763c436077c997f731c16b09663f6d032e0ad

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