Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76b2977fd777cb8…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 17:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3260c9c910bc7599d2829a6278c8ff5a SHA-1: a8b68e1b45810972dafc717c5bd72937ad4ca227 SHA-256: d76b2977fd777cb8625e210eb288194dd5a4cca7c83d73fe908810436f25b10d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the extensive use of link farms suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://energy-labels.com/userfiles/file/90611187645.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/66370494962.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/jaxav.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/fevuzunifuvimoxarabirevak.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c6f0a3e31554b5bf801733f2121b73db/xireziworatadixut.pdfIn PDF document text
    • http://le383.com/uploads/files/66108600488.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/552ab72dfa86bff67412c93ab1f9dba4/bipizanijipekovoxo.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/5071829705.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613980f8cd62c---13253661778.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/95519555211.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/84a2e6c7aa7a8fef5a74d685ca655c0e/lezarugililibalokilumofo.pdfIn PDF document text
    • http://candientushinko.com/images/file/5844580628.pdfIn PDF document text
    • https://rm-parketi.si/uploads/fuxazemeb.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613a674a28c3a---19922819637.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120912065688.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xunovupamuxezitagad.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/vetezufedu.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/dusun.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/09/57821573209.pdfIn PDF document text
    • https://emprenderem.cl/files/mewodujavoserulibom.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jiwenuv.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c571d8be625d0aac4b235e9982280db0/90512129200.pdfIn PDF document text
    • https://dm288.rs/slicice/file/fenewetotodotinire.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/98767417074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=memory+clean+up+androidPDF 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_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 19936 bytes
SHA-256: 2c70356dd9e47f7b93677aae02ecda2d979627dd01b00d0feb60a584bbfa7a92
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 10616 bytes
SHA-256: 1d3df659c05128126e90d3d294a871d3258f68ffa2234375bb1a16d2a3fdca58
font_02_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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