Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac063738290adef9…

MALICIOUS

PDF

83.7 KB Created: 2021-06-27 16:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b9527ced1d3ddc3dc2fb9b8d2dbb94b SHA-1: d5da1b1291002af701a4edeee495ef6f1339b9c3 SHA-256: ac063738290adef9eead4b8e4cc98127b658e3a872234a86fa72d02ddeb8f239
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/hr8asu51u8vesa4bj7gvjtj921/niwetoregirunot.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d8dc7c4f4bec0c889cf5a23a7b04b117/11256176445.pdf
    • http://cedule-plachty.cz/files/file/91030595788.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a60313537b0a872db60648716d5074c/vufuseko.pdf
    • http://tokyoto.pl/UserFiles/file/92470052004.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e505ee45a2---58080949535.pdf
    • http://quickvideo.nl/userfiles/file/jibafodibavegozobe.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607185e3f0af0---97849126158.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be1f1a7ff6---76348762928.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077a0d827f4f---futorure.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/aa4f210196d65cc8b933c8e238f7e7dd/10112356134.pdf
    • http://technocom.pl/editor/file/nerutadiru.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2fcda8bb---renusenazarap.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gvo39hg9ovlgmtbbs1609ugvld/80006861013.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8c24323ccd08939bfc10f4e9b43c940f/nukimewufekoredademeji.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u1muluqu7s1dekb4lj531abgcv/73872885045.pdf
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/wozumisiwirubinenezozipe.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d884c3f9c83859a63d1e9ae54ce800d3/31965829253.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075389c5c00b---79707429885.pdf
    • http://dataction.org/demo/dataction/media/22564591285.pdf
    • http://thsport.dk/ckfinder/userfiles/files/18172151344.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=present+simple+infinitive
    • 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_off0000e3e5.bin
e0c3343749b97a05962a8f7659d82f2f0b5525240e29ba9ed19b5302d8495973
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 17768 bytes
font_01_sfnt_off00011107.bin
a634ba03bd151f75263038695584e378ce1a1b5048f2915405962b30bfbe0c5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 10304 bytes
font_02_sfnt_off0001283b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 16792 bytes