Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c1dd3eb4af0ab3…

MALICIOUS

PDF

99.4 KB Created: 2021-08-07 11:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4abeebbb5ac74cd0fb991208e529201 SHA-1: 64a916da3848021c062279b086f021010cb5f1b5 SHA-256: 79c1dd3eb4af0ab3cd6404eb7860dd68bf47b5d15f0dd6f9b407a88b06d37234
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports this, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=what+are+the+latin+numbers+1+20 PDF link annotation
    • http://csc021.com/userfiles/file/20210621162758_epmr36.pdfIn PDF document text
    • http://ozari-ua.com/files/file/zidexulibijikaxa.pdfIn PDF document text
    • http://gysanya.com/upload/file/210804040346395869lob62irzjfjp.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607233c3548c9---fodedowejorow.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/50blqmjvqvj199sd1b4htahho7/825935983.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/dovigew.pdfIn PDF document text
    • http://cuatudongbinhduong.net/uploads/files/36817720742.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160719ea29769e---70281556402.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/23242034417.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/nutetogi.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/gegimasorewubazu.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210713183355_jjcmkm.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/38030508297.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e1f24daf---63917318450.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/72824865723.pdfIn PDF document text
    • http://ahchala.com/img/file/xigejuwigusinipera.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mmvm6v79ce4k4toangp2mhmfds/gigur.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a783d9fd1f---42831205301.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/67506694056.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/jotavojenafoxu.pdfIn PDF document text
    • https://papiratisk.cz/soubory/75762467799.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/23727700512.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/97677825424.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 21272 bytes
SHA-256: 91438e035b6d245da7db5ed41098c503c99ec042a24401a055f40b75a0814455
font_02_sfnt_off000150d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D3 10780 bytes
SHA-256: f1b58f94614186a84d77f092fb8af59d8b2989626f916dd58cc577aa8af5d6d0
font_03_sfnt_off00016987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16987 16544 bytes
SHA-256: 865e1fac8554a7ccc42b5f3eddc221ceeae6e8f6b009d20d11986d6433c7eebe

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