Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e83928c359897e1…

MALICIOUS

PDF

81.1 KB Created: 2021-07-23 11:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b470378ce8af3758dd8038c03eb28c49 SHA-1: d93a44e24507bfb72f0d4aad4502bf99f44e4b85 SHA-256: 9e83928c359897e1a261fdb6256a5716837f4f52becfe282778b3a391b41fee8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the embedded URLs suggest it's designed to lead users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9edde3739---xiliguminadamizuzenavepi.pdf
    • http://chanakyaaerospacedefence.com/userfiles/file/86474502075.pdf
    • https://ratsimae.eemedia/contents/file/fafoxifilezofujuduk.pdf
    • http://caratow.eu/userfiles/file/75954608204.pdf
    • https://pui-vital.ro/msg_media/file/tazitigu.pdf
    • https://accuratesearch.com/userfiles/file/8818416923.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b23500c0834573bb0f4707806bb0dcfb/31463960072.pdf
    • http://masonhn.com/d/files/68617914236.pdf
    • http://haohanlegend.com/Uploadfiles/files/38923855721.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6be8cccb70---geter.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ehndgamb36spq7fvc0f2ld5mai/fidoxirobemusufefidujewix.pdf
    • http://www.biotanika.pl/upload/file/51902051627.pdf
    • http://studioboscono.it/userfiles/files/4625639383.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/24496171625.pdf
    • http://coffee33.ru/archive/file/vomemuwowozitibadixuju.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607084a8f2357---tidapobalupeniwumekoru.pdf
    • http://scro.ru/pic/file/lejit.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/8v735f0mj8l055tvhmgbs5p0uc/38922059827.pdf
    • http://brilspa.ro/userfiles/file///18561581908.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/37lts7cf2ppoh8h8l09ohiieuf/5044159233.pdf
    • http://caratow.nl/userfiles/file/3931758503.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/1ef59c80dc4c0708b17a5ea27e6d357a/bazumexetizex.pdf
    • http://eaas-journal.org/survey/userfiles/files/xasijotuxoripav.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608817c009ded---8976122327.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4f5550c30409186db5c1c1d59a499c72/15899451502.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sesame+street+bedtime+stories+and+songs+1986+vhs
    • 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_off0000d732.bin
cff4b249476f986460b00d634ace660f46104125174578189340991058016a41
pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16924 bytes
font_01_sfnt_off00010337.bin
624e3a1063565e625ae88e1765fbe65cacb39ddeb846f3e79ed30dfc3b572ee7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10337 11524 bytes
font_02_sfnt_off00011e1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 16792 bytes