Malicious PDF — malware analysis report

Static analysis result for SHA-256 04cbaebcca12ee62…

MALICIOUS

PDF

74.1 KB Created: 2021-10-02 12:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a03726d868f692e72e490b53e5cb2414 SHA-1: d32b512a2cac5a61ce7a7dafbcf4b254bc6e7d54 SHA-256: 04cbaebcca12ee62f5958dc7f71f61131cdb8c064d63eee7b2c2c2fdc94f1651
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5049

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laborke.ru/uplcv?utm_term=rational+exponent+rule PDF link annotation
    • http://woykoff.hu/upload/file/67760114365.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/ruverafewowesedesokir.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/abd762a4a5736ce22ad5163ffcf6feba/dowufimuluvodizimiw.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/pesidiwu.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/motodilixatugazodoroxigo.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/35472400856.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/4374607641.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/79555139018.pdfIn PDF document text
    • http://freestyler.cz/img/file/lodewawe.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ppd7vm0bigb0vinjeh7ff6e75/33219016606.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/53598070106.pdfIn PDF document text
    • https://kaisar168.com/contents/files/mupibomerinevefodugazutej.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tv8pphkun5ljjvpfsf6tckndr9/pekaridinoputabomil.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/kijegopetirepopumaxosu.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/fatitez.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pogureboburos.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/farizagawa.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/dasemo.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/tuzod.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/94663221636.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-24/20210924130316820474.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/9318308001.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/fidonagesevisoweketewabam.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614066ec9ad31---gitawurazusemapov.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ebc88c268e1677a801ebda41c623f179/xedexi.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1f1etkqi91jvvmoog2ha4t1hdp/88266693053.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/36852533510.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/dagowu.pdfIn 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_off0000c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44B 10324 bytes
SHA-256: d3416e4558106d1d11c6da149f2836b056e466fce86dd99c71d00a962e0ae4bf
font_01_sfnt_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 19644 bytes
SHA-256: b0aed00d889e758394a26afad5455d9849334d9adb680beecea5a081acad5229