Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfebdc0dd18d32b…

MALICIOUS

PDF

177.7 KB Created: 2021-06-14 22:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2f397095bb9fa741bbdea3ed7466e679 SHA-1: 0bc662c64e0e28f42fe551c01d1950449130bbc3 SHA-256: 7cfebdc0dd18d32be7c9213b7af351bb79103adf3a869aa891d6aad313632edc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8065

Heuristics 5

  • 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
  • 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=o+captain+my+captain+analysis+pdf PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864b0cc7c11---18973161579.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/s2lkip8c94r5ktt4dbn7fh7g3u/dexemepufu.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/94741173459.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160730f79c46e6---gilaluf.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/41668954172.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1l97dl15rcfuvfrejlge756dvl/wepasewiseten.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ad99680a---86731601161.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/79389804518.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098930d8161c---benokenarodawadugedonibud.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efbe268ea1---befizofetenipav.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076def372ba4---gufesujomamudax.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/15685943801.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084565c7c580---ziloxifagiwamelopijugodu.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2k1tafn5k4do2ioaatl6i6l1mv/wulopugopabukof.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/1021279853.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/98362993904.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a233ce3ac0b---jawasetawari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 143892 bytes
SHA-256: baed7b76f49d0ec319fc3ebf78e6a071777647f4b7af718748965f510a893fe4
font_01_sfnt_off0002a2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A2E5 5332 bytes
SHA-256: eb1fa21bed138ed4a0735346d439d5a4798c35159618b926cc21906f8bcd22e1

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