Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c14f64ae09ab20d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a61e791217a4421ef4ba30ee9bf812d7 SHA-1: f4d750d5b94016a08782b6ce745df1ca3b691a62 SHA-256: 7c14f64ae09ab20d6db229f123c5205736fd9b5845e8875f839beeb5bc63114d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely for phishing or malware distribution. The heuristic 'SE_CALLBACK_LURE' further suggests a potential callback phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anhuizpyy.com/upload_fck/file/2021-9-7/20210907231522577742.pdf In PDF document text
    • http://connectcontrol.net/files/userfiles/files/tevenorekedakanafefu.pdfIn PDF document text
    • http://hainfelderteich.at/87329200799.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/86108500332.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/sesoxipede.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/jopukijaget.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/54520356349.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ae2ii9ne7lurhs71bofbqjb7p0/54323871195.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fomupikupigebolepubarat.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/tiwuxonamepezamolipemu.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/wewagekowode.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/53547010872.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/pijuzosagafavokuxegusul.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/sosozanabakufakegoniromun.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/7629736922.pdfIn PDF document text
    • http://unityproductions.com/upload/files/69341293221.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gitumokekonumuma.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/95104374370.pdfIn PDF document text
    • http://charivne.info/images/file/katilitozumeluleg.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433cf2a44e1---wukudikitarudipixesuref.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/minemovusemutamawevupawug.pdfIn PDF document text
    • http://odumakus.com/uploads/files/sigiwuvawuwupuge.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/26470301223.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0676ac892---vuwijil.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/24727907462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=fnf+tricky+apkPDF 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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 18744 bytes
SHA-256: a3e8a1d663b2fb31ff41749c06dd3c58f170de1ac1a1f14240c702cff6141b95
font_01_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10188 bytes
SHA-256: 4ee230deebc79624054e23d26efa5f96f0ab1d61855ac894812f410a687b8a61
font_02_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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