Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef68d4f8675221b…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 01:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fa0e4f9b2c396f7bcec6145121e88ad SHA-1: de652914920f374e6615c81c5484fa5baf8259d2 SHA-256: 6ef68d4f8675221b55d7697e6deab7997d3e8f523f135730787dd65b6a4a609b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. These URLs likely serve as a link farm to distribute further malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The primary function appears to be redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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 https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/50541fe73ded0d287188916cf02d9da9/wonasenuvukivov.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jorogolisone.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/1072g44t43enak9u92lnp0lg7m/43543104997.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/h8mneeob4te1qn94oj1ld25kaf/62825452499.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f12360bd12d---zemofijaro.pdfIn PDF document text
    • http://com123.vn/uploads/file/sunuxagobunabowalixib.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d4f342a5c---41582961255.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/8266185477.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/sitemawixiziforo.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e9258039---desekagifomedekaxorapep.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610de8c8d3845---42477538759.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/nomebogekexes.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/41728474906.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/20852725549.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/fipalipezajenafe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc9552010b---15548970855.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/zanusipanewegasebojolasip.pdfIn PDF document text
    • https://wrd13.com/force/file/besavutikagizubela.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lelerekasenavodolorino.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66abc5aac---besowaw.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/41833421004.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab56a2bd3---wokejotumafirozojodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=araria+map+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC248 9972 bytes
SHA-256: 683d85ad4e09877ffbead08552e84870a006f3bee0c145b51e383d12f2a92d5e
font_01_sfnt_off0000d843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD843 17100 bytes
SHA-256: bba3ce7a041e4ec5a0bf0a95b07f9f0542a73ed0dec9571a038f76ca0b1cffef
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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