Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fcc85ea110ba37…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 16:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f41287211738574db1bb4626bfe2a30a SHA-1: 9c65af17c8b687404d85b4d43d0687ecd651dd6f SHA-256: e8fcc85ea110ba37b58e9cee041bd0a2770fb6989a464ee406bdf9ee9f31b4f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to links hosted on compromised WordPress upload storage. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ibextrail.com/editor-images/61711134753.pdf In PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/57476334591.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/kadataxezugakusubot.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109241649073152.pdfIn PDF document text
    • https://camphacement.vn/upload/files/rojatebawulimag.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e8b48a4cb---zapijitop.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/96437042940.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/50352823887.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/zimupibuz.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/13180882631.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/86878245224.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/20130748701.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/womebigejavab.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/xoxerisiterovovoninikolak.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/7458880467.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109030407474213.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/xobuz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613c674e43d46---xexizowifoj.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebbf0a81a3---67915739010.pdfIn PDF document text
    • https://aromamarketing.md/img/files/98552735766.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/80334541522.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/vugafik.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/tuditasagazadimutowuwib.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/xewinebenesinasix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=disassembly+3d+hackPDF 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_off0000aef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC710 10732 bytes
SHA-256: 57901b60d9b90213ed47969e175101403d1d083c4b2e4532830716d58f1efafb
font_02_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 15796 bytes
SHA-256: 93928bb8099ebd0b0ca8058318bb993a43f1809dc0048f2ca1ed2acd8762e9ba