Malicious PDF — malware analysis report

Static analysis result for SHA-256 388837e73bee9764…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 23:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddd809b1c553d0734031eaf0a69f8eca SHA-1: 79ca1b8922c91ff121d64f36d52cd29aee5b1584 SHA-256: 388837e73bee9764541e5f578b94f68a888a5b808a6aa9737d81dceb327ea361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The PDF structure itself appears to be a link farm designed to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=today%27s+devotional+verse PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/nmen19mciqk5lku67g3uj3i3mb/beporopefatebipagefax.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd1501e822---guxokegaka.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e57dbeb80---5708304433.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/64317300152.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608607de08a3f---72322154218.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/03b71d0ed3f3980b1bcc0f96ad3f57e7/16681549716.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/fokerojeseruxavomixugup.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lagugapunikuxoko.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/aae2f01e2b9ca23bd946bc4b3d4daed6/78782831580.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050301592694.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vsbrv8k32vbpmog66gh9ra7l7j/posepolilufu.pdfIn PDF document text
    • http://zxsolar.com/d/files/72958504209.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d5dce50c---9015736375.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/wudozejomotoxigutigajataw.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/vedogakotifudugise.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/kai83rrp9v4ugs8sk4bfea4ck7/nurox.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/c4a9b52c875da1a009b40f1686746e86/dovomomeravukuxolus.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/55657002009.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xinipamewafobonagorewu.pdfIn PDF document text
    • http://drironcat.com/images/file/85756284686.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ef0d6e200dbb5cee3254ee269e45e31c/wepepetunubosabazazur.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00281a2be---patavulapemoniti.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a5ea3cc76f908729ed50eb69c6e95185/nukutopibedadiwisef.pdfIn PDF document text
    • 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_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 17820 bytes
SHA-256: 4db6dbded07a88b22693dadc914b559b49185877352f50359536e03109292153
font_01_sfnt_off0001268c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268C 10420 bytes
SHA-256: 24767d78b8eaa217979178f3bc3d805c47945419fdc6f565119b1e96f1467540
font_02_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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