Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc488becfac213e9…

MALICIOUS

PDF

130.3 KB Created: 2021-08-08 13:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fe42a98eeb129c5469585c9caa33900 SHA-1: 643a002f8797d79a1e25f763cf0d00c2cd750b62 SHA-256: fc488becfac213e941b0aeef3993d6f71439a060c415d484ad8949302fdd153e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://smidgel.ru/uplcv?utm_term=mbti+personality+test+scoring+sheet PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4b565cf893e4de56dbaaaed395d19372/93213426790.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/38408829125.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/lukolebatulunu.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/0bb1c99e9fc79a126c13ab6d65158dd5/xawetogipurop.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd312a0898---93583737996.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/31495006897.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b6b7fd27---29109176145.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ad1ce7fd93ee34872bbe5283a047fbe9/56926796983.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/47634686410.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085fed05a3b6---71240683823.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/18617696530.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/derivowuzi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812b880c75c---verojufobetu.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/54721863078.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/ketevu.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/ratogamosibapexa.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723af749298---41993903330.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/1b37f4ebded64f9caa6ea8ac9ff593c3/79013276454.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/300854245103.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/vafokosabisijenitumo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29a30e56---xanotikusab.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/31014264089.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1ffd4d2361f6f93dd73038dcbcdb24f7/30003689408.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_off00019937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19937 10900 bytes
SHA-256: a44bc2c373de3dfbf6d677e1e4c0de4ff8e35e604412859f7c7f0ceba67552ff
font_01_sfnt_off0001b23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B23E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA50 17948 bytes
SHA-256: b2277197814d53f9a65be54b8ac170705ff14e1ef0ddd3986a9002d08414c53c

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