Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df2d61ce900e4b…

MALICIOUS

PDF

88.5 KB Created: 2021-07-12 17:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60bce2c6024a5ddac711337fa5c656ee SHA-1: 1095927580ca26dbd9d75d793fed0d5673849fdf SHA-256: c3df2d61ce900e4bad032edb9b8b24773c0e71a9f34954be69232bc0d0df6d4a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • 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://medicaldistri.com/ckfinder_files/files/peguvo.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078014b3e756---fuvasite.pdf
    • http://aire-limpio.com/img/editor/file/dipezamaziwepaxigibuk.pdf
    • http://classiccar-jp.com/js/upload/files/63017365217.pdf
    • http://dragonera.cn/admin/userfiles/file/mipolaz.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160790d9cadfe1---11152998717.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27e11622bc---wetud.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718980d9b39---59827993850.pdf
    • http://matkinhantai.com/luutru/files/19088246056.pdf
    • http://nousgarage.com/userfiles/file/95695944086.pdf
    • http://actybrain-consult.com/Upload/files/50068578560.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/504afaa9dd0426749345b6d95146d738/fepizapa.pdf
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/bodokujiruruxu.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/lj8l3ehspbmv65odcuf38enua7/92095289632.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a4e3f3064348ce32a891075382549246/53047547868.pdf
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/65994963509.pdf
    • http://agenziadiviaggiocagliari.it/file/konividozavokinetat.pdf
    • http://hanleyresources.com/images/40400317260.pdf
    • http://www.contectrade.hu/fckfiles/file/ropipegupeveripatose.pdf
    • http://ned.ru/uploads/files/44920046982.pdf
    • https://harryfok.com/ckfinder/userfiles/files/77344563839.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b3658c85c1e---73993253704.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608b69df99dcd---57187467396.pdf
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/23157932666.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=definition+of+marginalized+communities
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f457.bin
c359e082f5afbe420284174e25abc8e0e077f8a092e6d37b0e5a78ba83a0d441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 17996 bytes
font_01_sfnt_off00012381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
font_02_sfnt_off00013b98.bin
900ec0e78c17df28c141d51cd9ef723f8d007f6f08ea1fa9af924cfb079b5f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B98 10980 bytes

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