Malicious PDF — malware analysis report

Static analysis result for SHA-256 2251cd7a4248d750…

MALICIOUS

PDF

93.6 KB Created: 2021-09-02 02:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cbf2e556a23743207d3a84eb196d1cc5 SHA-1: fdb39d28304cac50f93e3292bf7c5e647141be0c SHA-256: 2251cd7a4248d7501a87519ed280e8ee0df38acd34b1e5f6b3582d6492fdc4ea
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, with many URLs pointing to potentially compromised WordPress upload directories or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c6321967c---totir.pdf In PDF document text
    • https://pjkconstruction.ca/images/file/30710339531.pdfIn PDF document text
    • http://matras-devison.com/upload/file/65291437185.pdfIn PDF document text
    • http://goldia.cz/data/file/40587001334.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86907040018.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/73930526163.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ee79902bd3095bbecacc71772b78171d/zimuloruj.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/kukotowosakexatazuruliza.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/sadosiletowegegub.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/36455850985.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/f6ll5qhj6ca3lod24likuessjk/61008683619.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/sinisixokorupalu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbac3d0990---rivugoguwuxap.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vgo0iuj5oimeb7p4kns9abjov9/xivatiwavuvukawuwesez.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/68442041867.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814d27af04f---lirokirezerabiri.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088c04962c93---figenizepuvomaso.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/46675947b050b725cf52620ea608a12d.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/51b0cb3bb913f9690c37a53fd41ddac9/talofur.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/3a24a1b689dce89069852faba7e462fa/gojixafipubasopememotoz.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f9f1e2938---10426035535.pdfIn PDF document text
    • http://boxethai38.comupload/file/59132412001.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980891f39f---52950800594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=uconnect+5+manualPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 19228 bytes
SHA-256: e6899df8b2b101de449ca0680a128d822c31cb55afc29f98ab86036518bc992a
font_02_sfnt_off000150f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F0 10272 bytes
SHA-256: 4aea616b2f5b9a7531ffbf484195b7475efb42ea60ce1a05bd5803e2a06092d2

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