Malicious PDF — malware analysis report

Static analysis result for SHA-256 42acce5640e4238d…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 00:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd9abcc9f76baa8196387add0bfe76e4 SHA-1: ff23812de5669fb1398f355c83170821c9a6323a SHA-256: 42acce5640e4238d4f90481cf5731cd2dc6ee277cd6adbe8bb777fc08af87b8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

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 https://chcial.ru/uplcv?utm_term=rooftop+run+apk PDF link annotation
    • https://nawaasha.org/userfiles/file/jukadejaripefa.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/zalavadimep.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141389650a02---bigajipevufefilizavemomos.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/9dca09e64e5760bade0fbcb12fd55c96/84450397608.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/gipukit.pdfIn PDF document text
    • http://ubest.ru/images/file/52362237791.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/zorutazur.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210913025601.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/75939297890.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/3402034347.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/23931298807.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/vaxorinaximukixuzoz.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/bekugepebixefej.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xilib.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65813a8ea---giledeled.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/janopepunaz.pdfIn PDF document text
    • https://solturism.ro/images/file/24762125735.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8bf6ae319c3f41b011a82e85f9019892/besofetuwuparemiwonepar.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/88622059780.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/99646260140.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/78916407691.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/58000741159.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/74283306238.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tanaja.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/nexumasunitofulutivomu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/pozazimujefixedigo.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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 17960 bytes
SHA-256: e3622be19b07ba2128e1d7037654d602210d8a2f959a2f9eb0acde6880bfe6ff
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 10152 bytes
SHA-256: 9b0e8736689534982a18b1779be410915dc8d0dd0555f56859a83cdb7d086566

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