Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fb31671fa923c1…

MALICIOUS

PDF

90.0 KB Created: 2021-06-28 12:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f77fe3b2cf7a88907febb78383d611f SHA-1: 07d6d74144afc507b0530437617a2aa746d3c8d0 SHA-256: 38fb31671fa923c14a7d4deb2f2d218e9fcead7c9ff2bf91e5be984569850f10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aad7029529---56025860994.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36f70bbac4---seratusotelininez.pdf
    • https://satybharat.com/ci/userfiles/files/vuxikibijeferozusas.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee0f3ccb8a---peleluwolalor.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/96275425173.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608137f7eabab---toxoruzipubovadutukob.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/07f3f2b408ce21f6e9718fe3773da4de/39110879046.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/9958673783.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/vupapulijivexabo.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bacae0b988c---sudewiwikapa.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/vijavagetasesasim.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417ba62116---5920712282.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4ea947e3---93099194429.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea0597a87---97016647428.pdf
    • http://nuraski.pl/wsg/userfiles/danim.pdf
    • http://labotinnghia.com/img/files/vutuxijujulajemumunupobum.pdf
    • https://cgeminfos.ma/upload/file/68296975100.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec42899c76---19253159904.pdf
    • https://marljivo.hr/UserFiles/files/33812145528.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/7ba3a0a78c0b4618995c9085e416c6cf/jevuxijovozuxuxer.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076163034a00---60899802269.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/galunatepi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+drinking+100+oz+of+water+a+day+too+much
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin
539d589fd86769a8909351d0f0b7c22a9f7e0907f7671639d686f43344df0341
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 16860 bytes
font_01_sfnt_off00012619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 16792 bytes
font_02_sfnt_off00013e30.bin
4803dbb2c5f2fafdd5f918622528e9164f6d551a6bf8aa443f61ba698e4abe12
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E30 11456 bytes