Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3100cc28a7bcc9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 12:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5724f0a8ac39b113c1939838318af77b SHA-1: ed963ebe07326a7824c7c64cf88836e14fcd8cf9 SHA-256: 6f3100cc28a7bcc9f48f0a6f39b0ad43acee358a85400fdcbf76e5dd0b849692
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document directly requests sensitive recovery secrets, strongly suggesting a phishing or social engineering attack. The presence of numerous external URLs, including those hosted on compromised WordPress sites and disposable domains, further supports this, as they likely lead to malicious content or phishing pages. Although no scripts were explicitly extracted, the PDF format and the nature of the lure align with common phishing techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://oniceh.ru/uplcv?utm_term=adb+command+to+reboot+into+recovery PDF link annotation
    • http://nagymester.com/userfiles/file/54673632730.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_131029.pdfIn PDF document text
    • https://kopari.hu/files/file/sibulidaxujutegobivozur.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/69363216462.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa83f3ea62---widipevowopaj.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/dukixuzigimavikaralew.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/71593802660.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/67015985242.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/nobifuribeguwipokaliguf.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/gajinibapeboledudas.pdfIn PDF document text
    • http://skisun.it/userfiles/files/wamukowiwakijitofoju.pdfIn PDF document text
    • https://oasis-travel.ro/files/dixewiwurotagaminudabiva.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dovodis.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7fe3ed16---73924594175.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/jumufovowukipewomazenebew.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910094833.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/2183706042.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889db9ca2d---2000543188.pdfIn PDF document text
    • http://tfforming.ru/d/files/47743804796.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/tiditawozubedovu.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/20278883304.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 18388 bytes
SHA-256: 1b57932f020e45a57dcfb75fa9f29c482fe35f5f5a8a16e01597a76be79812a3
font_01_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10620 bytes
SHA-256: 66fca4a84a267caeed8821ae743792136d36489b7aaca5b300a70b1f8deacc88

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