Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a60755836badbf…

MALICIOUS

PDF

93.0 KB Created: 2021-06-25 22:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92e989af150d53e6250a074ef9a99035 SHA-1: 7a26ef759771914537272e0939b86c722ac99f4a SHA-256: b3a60755836badbf0f05826fe6cd8320c1093b5340f9d00b1bf7f4b612b08b21
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://archism.ru/uplcv?utm_term=inventory+in+tally+erp+9+pdf
    • https://kurek-rowery.pl/user_pict/file/ririgirewekosogemisote.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f69c7ce41d6910f2000ba1ceeb951eb6/38831795248.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6bf534e6---30577717001.pdf
    • http://ciaooo.ru/uploades/userfiles/file/giveparali.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pjfv83v8l2ev88oko9n2c4gqdc/mebafajokapi.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/j7pc4akek7u89v92rkaqm4m596/jexamumerexef.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e573737---rowowonawuxozuwa.pdf
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/paxufegi.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb05d266f5---6155991897.pdf
    • https://kodcomputers.ro/2664/uploads/58477594698.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ssmbn0lbih3nj672jn24drhen5/88414021003.pdf
    • https://dintek.eu/uploads/file/bezadimejelizap.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hr3ds3327o1j6d3lc9dd2m1n3p/wiguvib.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/52254390242.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160784b3cb9955---45515135151.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2f964f7b95095c2423e7703c12442caf/8549746739.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/takn1b30scbi0apt5rl7d4fhkn/6458505705.pdf
    • https://birotex.rs/images/files/siwiv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3245c1a0---zizikolojajigegirak.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/358f493583bf4d489647147fbff9aa8c/66891215370.pdf
    • https://ladangmimpi.com/contents//files/41225182825.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/3sot435venf5751gganh49ln30/63773143430.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079f77aa211e---roposijonitibevinodep.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608088a1bf686---5877573482.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/xubijejitukomiwufivag.pdf
    • 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_off00010922.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
font_01_sfnt_off00012134.bin
ae7dfa7a2f53a7a668b7ff7580964df586dfa91ea68cd6216316f60afdc35b44
pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 17560 bytes
font_02_sfnt_off00014e6f.bin
92e772f8d23f03c47be9bdf9830d14e25d5cc13fb34160f5c4593209e48f8cd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6F 10620 bytes