Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b84d4c01cd0eb8d…

MALICIOUS

PDF

93.6 KB Created: 2021-07-13 18:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c865fd04a73c5b38b3666b43e84dfd2d SHA-1: 18b28dcb8a294b1b11edec7b1913122d8da2bca6 SHA-256: 2b84d4c01cd0eb8d61b19100b60836b62aceada62c8652f4eea3fc19ec8cd695
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains a link farm pointing to multiple compromised WordPress sites, suggesting it is designed to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084ccc2c1201---16842200635.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c954f5a7efb---xafowufitisagutufufor.pdf
    • https://wecareu.net/ckfinder/userfiles/files/83834867804.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4f76d4e5---fawabizubaxe.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c195083926885c18ad2be3cee455ee34/nemafoloju.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ssb5a72iab4022abvml4ql8nok/58721718224.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862c7acff69---rikefewixonelu.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g826hls1pact7csolo17s5njc0/desokamanixisixolugajaxo.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0575320fc---gifuti.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1c3c34e4295addb23cc2ee8786cb31e4/fubujeritaxusen.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b2cd4b775239ec74f66f046980228b98/34009194203.pdf
    • https://artinterior.bg/userfiles/file/4302369499.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e899ef0e0---jemowavanejabogub.pdf
    • https://okna-stv.ru/userfiles/files/lufiduvagedip.pdf
    • http://border-inn.com/CKEdit/upload/files/81490971856.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/vmh291juph4i55md28nr2he0ml/wofabip.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4898a8794ff2dba7fad65654fc0b6b07/30972943062.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c2f54f4eb5fd087eb0b45e3b0563d6a3/31899293867.pdf
    • https://aradovan.com/userfiles/file/9262056906.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bb6a34b46---dikifinapagud.pdf
    • http://aranykoronakft.hu/userfiles/file/modawawenibukuzuz.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6a769897---95301314570.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730284cef9a---96298339042.pdf
    • https://299-45.com/CKEdit/upload/files/vemoxujijuwobipusodes.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=there+this+these+those
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f252.bin
9ae6f203eb25f924baee4b4e0761eeb09ff9149828e03d202299b5151eb88e80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 9856 bytes
font_01_sfnt_off0001082e.bin
069be1c3fec849cdd01ba9b3e5a09968c087cbafabb28dc9de41cbf6781dad04
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 20144 bytes
font_02_sfnt_off000139b4.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 16164 bytes
font_03_sfnt_off00014f2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 16792 bytes