Malicious PDF — malware analysis report

Static analysis result for SHA-256 d871ea44ac129493…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 03:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6878701c6211ac0e95277b67187f92f3 SHA-1: a510940baf9e03eafc62e7277c979e587b3c4dd6 SHA-256: d871ea44ac12949373d60560acc3130df08ca6ed6ab786add62f124f51eb9517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jajugroup.com/ckfinder/userfiles/files/paladirekemonodudilovake.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/92088018278.pdf
    • https://tessuno.com/upload/files/60e5701f4909b.pdf
    • http://millionsdiscount.com/mo_images/files/85153028028.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/r7ik68nk2b1e66ns5ab1e3kv61/12283905493.pdf
    • https://ingatlansos.hu/images/userfiles/file/3462084769.pdf
    • http://fogathajtohirek.hu/fckfiles/file/25579812156.pdf
    • https://telewebmarketing.com/FCKeditor/file/77526423607.pdf
    • https://communeouchamps.fr/userfiles/file/pujopul.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/tarofimep.pdf
    • http://files.ibiza-ferien.de/file/60048324285.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/nulosovogati.pdf
    • http://www.toptehnik.si/images/3868215912.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a030e03f62---97533747253.pdf
    • https://wecareprogram.org/images/file/12061775964.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/14724287546.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f824b343f5---82400715786.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa5acb317---tusive.pdf
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/82222958966.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/knqooa0gd1fosgl4k3e07hj0av/25011779337.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bf03e445537520f0910fcb8a17320ebd/rebasejotunawor.pdf
    • https://mandarinkinesiska.com/userfiles/file/55308212133.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manual+samsung+s8+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66f.bin
ed5a20e25198f66e9810d13f75cb9f00033b7a6173380a717f3fe33aebdfcf15
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66F 10600 bytes
font_01_sfnt_off0000fe5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
font_02_sfnt_off00011671.bin
5d1f8a032ff654ac09b93415f63bfcacba97740aae9dcd14416a858a812fe4a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 18740 bytes