Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c910f4122e89db6…

MALICIOUS

PDF

91.6 KB Created: 2021-07-25 01:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 697a0f0d1cfb78079988cb3a6ac33ea2 SHA-1: e70a1d0c7025ed4d2fd3e89400b6443ef52b094d SHA-256: 7c910f4122e89db60431f0390301c14679d3f648c2c6df3ddc13775ac4011bd8
164 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://studiotravenzolo.it/userfiles/files/2682284881.pdf In PDF document text
    • http://waypl.pl/upload/File/19515054311.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0c6ed4c73bcfb39709dbe6c04c1b5da1/dawifajonifofokuvori.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/dojugetoxiseseramulirega.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/89984681009.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/bafatipa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0525f2cd0---zonizanasadonuxuwinowojog.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/xupuf.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/82399878573.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/ripemadezupuzuwis.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/kirulenubebokubuvud.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160afde553542c---bolalimipusone.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/bde87cf8aa0588385d144e70d0f05a86/xazogosipetemadirak.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/pegibunogegewuvetiwimodir.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/bosiguxoduvofusim.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/nelk3sjk3lnk8vkkkr0762dlvc/78639303462.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c743ddfba51d9bad2567a2656466f5e4/76281493882.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e62564b6dd8---temulurewasonomizud.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/32370601647.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/pepufinajotikaziniz.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/71887848617.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wubesur.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/pilajadusubu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a335b67a19b---46864079647.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe8206156f---27165360000.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ddba19fb---wegexisaxapibapeme.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8b5c1de95382bc4c9b9b4a359a5b7301/zunadufuwajijomaxuvo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/sudimaponifixikuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=game+guardian+%28no+root+apk+download+apkpure%29PDF link annotation
    • 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_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 17524 bytes
SHA-256: a91abd64a8a772f8c5747cba2f1ba09e38c80f80e32069a82ccfb92cb13cd09e
font_02_sfnt_off00014662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14662 11040 bytes
SHA-256: 87f7acf55dab5226136aaf12ab32c41a335b743ae6a5bf926c7e2f241300b227

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