Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6156a43e8cad58…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 00:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 854993d955124da9089a130ac1513a6e SHA-1: 44b0fa1a097f6b4f1db53c606dc30af940c76dcd SHA-256: db6156a43e8cad588cf51dfe1c8ce525f5c2ef282af6011f85cc08bd138945d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/beog7us2qpc80da2id6jue70dv/pabopukokenuzubeb.pdf In PDF document text
    • https://associazionedynamica.it/uploads/file/xamowososufabafaveremap.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6569bc19c---fazutud.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/bonenilikaw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/67156683505.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd63842df3---fumupunizawewanujizigas.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/3374520987.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/92f3aaa5fc73f167529ef11ae0b4bc5b/kunovomunex.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efa254a26---jibusegewuzabepegekawujod.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f749922f863---62462880481.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/bd86f8798698774f351311c24cf28eee/93580037894.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b79336045828a9e58ded8af29b0df354/7147890133.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/takewuwej.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/61374269694.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5d52cafe---60192187160.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/16ae0a4d74166e6820d7aa390233c274/62333025246.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cdda2f3e6---tafuwerojarajexifapexu.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/17722294856.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/ripawuxujezukix.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/26796550665.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52866e1ea---xunoxuwabaku.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/28540541622.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/gimiruratugumomovazalot.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855075dff90---rebararamikifejes.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/tudutumim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=langenscheidt+handw%C3%B6rterbuch+deutsch-arabisch+pdfPDF 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_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 20920 bytes
SHA-256: 28e987947e305dc7970d68e87c0ecf7856f5f1ef52e68846e9fb5d6957ee2a05
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 11264 bytes
SHA-256: 874c9c798a29a6d8825973fd04d2a52d8c0ef6afaebb3cd3a585466699499f03

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