Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea583e00739af03…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 05:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de17845713ed19e8f8bd3ebd0df5d987 SHA-1: 19060f2d33952a3f3b8cc3edf710de5951583a32 SHA-256: 7ea583e00739af0359032a7ec78c37964d0d6846349e5ecd158c82cedbad2952
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It functions as a link farm, with numerous embedded URLs pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and potentially evade detection. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://alumcity.ru/userfiles/file/38337359257.pdf In PDF document text
    • http://ominocoibaffi.it/userfiles/files/figakobedemubami.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc879e7db0---59489171908.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/48967030142.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/wujodenoduresoju.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16138df8842739---60733576245.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/borezakuse.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210906_132708.pdfPDF link annotation
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381df925567---valivimugote.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/73374805523.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/84676262480.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5664f39d724f5cb287118d9f8d1c5b96/46557369592.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/82503208121.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovewavikipitoxexolitunu.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/beliwixutufagotujuzuxuw.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/sapobuvejokuxizisexizi.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905203319843175.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6e8ac0290993ee9260f55905f2ffcd3e/60783548793.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/solebek.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/13629958064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hack+android+using+linkPDF 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_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 17576 bytes
SHA-256: d635de54a959bf2e734410752620941b7467f80dcaf6c862a3e6193406f340ce
font_01_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 10496 bytes
SHA-256: 306fc9858e9e762364f5ab93fc2644bd23992b4a323fe5ef858fb9d440a09c96

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