Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a38f97e97bddec8…

MALICIOUS

PDF

113.6 KB Created: 2021-09-17 04:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6722717cd0deaa5c5ee9e72fb17bc659 SHA-1: a7f1697cb79a719a207f2e8b3a1350eed6a62b72 SHA-256: 0a38f97e97bddec8c02e1c4d4691a5af7c7d781da26d42d4024aec5a7833158e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://bonaparte.cappencms.com/templates/files/govapasosiputel.pdf In PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/79765891461.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/44379830561.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/63305768735.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43107353588.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/33972659314.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/81723a130e90cfd01242be30ad97e1ec/91268809598.pdfIn PDF document text
    • http://wych123.com/upload/files/mirojotijupatuxu.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/99513426661.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/jemoxumukepejopenunufozi.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7u3inkpfj841fdl5t0s0ui9e23/rogebovisarigukuxixamij.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/retuzumomu.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/sizidojalemovip.pdfIn PDF document text
    • https://hiroyoung.com/data/files/vujawazazizuzo.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/rimimuvokomuso.pdfIn PDF document text
    • http://le383.com/uploads/files/68076996377.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/zuxari.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/80917236315.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/xukisidoposu.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/60293068951.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/wugonizubufudid.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/mosemawurofamudaliragiju.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/gotobunotijarotanurix.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c59b12903c---tivegi.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613550bccebb1---71028111959.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/pegufewiwabimoboxedij.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/4265727972.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/50704642350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+glazed+version+downloadPDF 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_off00015302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15302 10800 bytes
SHA-256: 2254b04870876f212a77a586a5786597ae93457880270904990435c1e183ccba
font_01_sfnt_off00016bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000183d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183D0 20148 bytes
SHA-256: 16d4a3560f4ac230bfa3ee901101226b6a38c6881210bf1fb462c9b32f0c85b4

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