Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eccf6b14c04f4c…

MALICIOUS

PDF

83.2 KB Created: 2021-08-26 08:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c22be58a093d9bc37d6d948b9e85a854 SHA-1: 7956ca80083193e47a68e30be37794d03cbca741 SHA-256: 16eccf6b14c04f4cea26f00477c1d3e36b3ba3d0a61e4e419b6812348053dfaa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f68cecc7015---xasavugemunuxogalobita.pdf In PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/xojoka.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/wumixuka.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/58086992877.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/debalafozibaxigozuvofa.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/7tfb1se0es6op8moira3gph5go/punozexutev.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160952463744a0---jegigikijenisenotora.pdfIn PDF document text
    • https://aokman-drive.com/d/files/davedafu.pdfIn PDF document text
    • https://phukienbep.net/media/files/17922076533.pdfIn PDF document text
    • http://metapolar.hu/tmp/nuteluwa.pdfIn PDF document text
    • https://cubic.is/userfiles/file/potigarizede.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02a624432---jaxefi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/73703332413.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/36503818944.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/4227248019.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/46279657544.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/midijo.pdfIn PDF document text
    • http://etnorom.hu/pictures/84783146617.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/fenusofirenusixi.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/73186808429.pdfIn PDF document text
    • https://nusamulticentralestari.com/Uploads/userfiles/files/mijofunivukapukajiw.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/6051487594.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/94902221005.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/31743329945.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160970e9b2a3ea---14075141246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=meaning+of+undisturbedPDF 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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 10716 bytes
SHA-256: 93b0d842592fba8fc28abf29bd4f88437764b79ebe3fed44be1737e6e5e3267e
font_01_sfnt_off0000fa91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA91 17100 bytes
SHA-256: 804475a639c512162c7f815d280e9856e197762d1e4a5f49ed40acd3c4a97bf2
font_02_sfnt_off00012730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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