Malicious PDF — malware analysis report

Static analysis result for SHA-256 0321c8455aebd2e1…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d286090cf16830613767f5ecac35f34 SHA-1: d098b1a30f4558bd524c98bb0f76a83d412ab2fe SHA-256: 0321c8455aebd2e14742474a70ae37fa9ab211dbf60da57b30a442ea0f85403c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on disposable domains or compromised CMS upload directories, forming a link farm. This is a common tactic for phishing or malware distribution. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dominoliberec.eu/images/file/files/boteda.pdf In PDF document text
    • http://licausi.it/userfiles/files/8914762862.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/9384107946.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dln26nm670ml2p442g5dei18mv/badejit.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/saxolebuxatowamozij.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/93810640672.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142366579616---76713415156.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/20185028146.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/81670045299.pdfIn PDF document text
    • http://freetds.net/userfiles/file/28294460921.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161465e940750e---27715448611.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/xijelenogilin.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/mopape.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/xokelezekoponabebemumuze.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/63578544675.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pawujiriraveveguvi.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/bopovelabenup.pdfIn PDF document text
    • http://friulanapanini.com/images/file/limewofepitenesetazor.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/j17pmamu6u1p0c6ck61u0m4900/26091465036.pdfIn PDF document text
    • http://fitviewer.com/files/file/jobimobeferaxu.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/musejegexineligipejo.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/luvegamujazilazofisafebem.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/68273514990.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/pilap.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/pebexovipajisesizomoj.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/zomokewelojufikalurebupof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sword+art+online+progressive+pdf+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_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 10900 bytes
SHA-256: 33e2b224ca9ea6bd2f454eb1de62dab11e0e15fd5b8c744615166a6a3219f636
font_01_sfnt_off0000e607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 17916 bytes
SHA-256: 4ff6ba9c1bbfb309a90fa8d7fa65e1bed88eb7fc53561a33ea0df232a419314e
font_02_sfnt_off000114a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1