Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8730b7d4d01bf8…

MALICIOUS

PDF

80.8 KB Created: 2021-08-30 04:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0932e1775dbb00f55ff9d0fd07b59e6d SHA-1: 1b41970664377332f7201ac1fa9fd6c1c2a1a5ed SHA-256: 4f8730b7d4d01bf87045c2c6e13dffe9a32bff171fbe526906bac3b0998506c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress installations and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, but the heuristics and URLs are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0c67a258---21282637088.pdf In PDF document text
    • http://w-f-l.de/user_img/file/mupizixe.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/itl1gn1v028n1o36kikk7iq5l1/favitavoxukomepavi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5361b395---ginatitemitabowotem.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/acaoa3820vi0si64m5gke9g8s4/jodexaxokogemijojuxur.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/76160685235.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/64032824283.pdfIn PDF document text
    • https://hgb.se/filer/file/92198556544.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8afc74015c30b82ac5a766503e18f1cf/15324880413.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/ripobediz.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/10d9c7641153b23051848787927b4ceb/96039909269.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/xivukadedaz.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/km680i8jc69ah95tsnvistt0n6/97984701595.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rq7s74qi5ndf96sornbk918fv4/6413325335.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/mojopabunotitaseti.pdfIn PDF document text
    • http://bociany.sk/media/file/80957835164.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B5926DCCD62.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/tusufoperuwuxemukira.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/69dc078dc7c19a004ae3a6ffba0d5b98/pegig.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/rupawabanobodenaxe.pdfIn PDF document text
    • https://ratodua.com/contents/files/62153189961.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a091bf08---sebavafo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6frjqbj29h7l4tnp9keqhoug40/pilifupol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=reported+speech+questions+examplesPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 11172 bytes
SHA-256: 9b4d5dcebf381f7244c1dd18c660da56d0619096ae5a7c25b780f3f44c677f86
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 18208 bytes
SHA-256: a1449ea85609f176ecb6573c82f63ecdae7f318a0e796b2b74539ff8be0f9cad
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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