Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05e93d089d4ef9c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 06:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b1f09913a060d6ad3959e3b2b8884c4 SHA-1: ec717b9efd04b41b09698d86784739d3ad8cdd2a SHA-256: e05e93d089d4ef9c9c6547bf432757ecc427cc66343f419dae8d8a08d9ac6851
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image designed to trick users into clicking a link, which redirects to a compromised WordPress site. The document's structure and numerous embedded URLs suggest it's part of a link farm aimed at directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://laborke.ru/uplcv?utm_term=installous+for+android PDF link annotation
    • https://songhong.info/userfiles/file/jidegirukobovejekugogolop.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/lunegebuvuzuvu.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/99575871908.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb18c0ce09---sijuxipufugu.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/fopuwigopuxip.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/wadotikagobatesivezefi.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1707e43d---74869172658.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614925b2c1f05---wixivepupolere.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/65839055720.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bebb3a9bc9---vujuxaduji.pdfIn PDF document text
    • https://truyenskyt.com/upload/ckeditor/files/sepesivesakexizurilebaf.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/genawulanif.pdfIn PDF document text
    • http://fnathservices.com/upload/file/fokomafofofosije.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/73418943399.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///20219171659555416.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/vefidujezovuminatitik.pdfIn PDF document text
    • https://brakos.it/file/86653944590.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/4910503837.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/gevuwevalegisopu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/8125372712.pdfIn PDF document text
    • https://solturism.ro/images/file/24762125735.pdfIn PDF document text
    • http://htwy.com/upload/file/mubiketalu.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/puduxotukixanugopoxonodu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zafidukowajemakiga.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/16945589820.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/25553351813.pdfIn PDF document text
    • 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_off0000b4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB2 13752 bytes
SHA-256: 555e15b0d8f5572551cd3e16b2fa54ab54f65623e845a4089a3ad4e9402ada50
font_02_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 10268 bytes
SHA-256: b365b91257ef83b8bb1b3152317aa198bc1174552740a395b14dd359ea11e89e

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