Malicious PDF — malware analysis report

Static analysis result for SHA-256 666a0a6fab26c0b2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 13:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8484481051976aa71f2a53fa127308e6 SHA-1: 5f2fa5afbecc1297bc148abcc955ab8fd5091149 SHA-256: 666a0a6fab26c0b2714c6e4f7917e740644fd040e3fc10d00b42f84acb529058
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=black+friday+2018+ads+pdf PDF link annotation
    • http://camionespanamericana.com/userfiles/file/forokufasavavifikip.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/likagek.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07iu5nmfqnl4p43vvsfljoikq2/6174579990.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160886ca7b36c1---50810042609.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba6ad79cd2909f7f512f07729c12db75/wuzufidodofowebofofaluraj.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54b972d661---28114468249.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/pokekepapok.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/28733e53795202910b6dfab43a04fdc2/pesevanisubiguvoje.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed4745bc9e7---19151693573.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a3146c574---7364013281.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/1c55f2094d1b8fd2d30d4ea769684598/97983159307.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/61546683431.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/mufez.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac59570b1---62147665860.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f296b71d76---26846893284.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/36002374608.pdfIn PDF document text
    • http://newworldss.com/uploads/file/87776517891.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/94410179498.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16269018148719.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/57673032086.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/kokalulepe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cbbe37b5c---25653404766.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_off0000b5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE07 10920 bytes
SHA-256: 7c8bc1d44c124ecc49ddd8e86cd37b205061035f89cf9b9ca355921ced07fbd5
font_02_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 15356 bytes
SHA-256: 7cec7f3276dbffc570b3341a82f32f3e8ba369fc621d3c841687d295d6e55aa2

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