Malicious PDF — malware analysis report

Static analysis result for SHA-256 872dd2afb753b065…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 05:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd2e2102c2e5a7a1523812eb47f12016 SHA-1: 33f042d8225a76588c040eb85449fa748ac2275e SHA-256: 872dd2afb753b065a8c66056b9dff4e77a76bc8f4d8ce32952bb686682308cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious or phishing content. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://selispin.com/calisma2/files/uploads/52984526364.pdf
    • http://pnmanagementsolutions.in/uploads/21917181892.pdf
    • http://chineseclothingonline.net/File/vixibibiwumubaj.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gobdo1je1je1kff6i06vs8mnsr/wowotili.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/hqafpfqi5qrnka6hh048ot3f47/51935043912.pdf
    • http://files.ibiza-ferien.de/file/siduwolimugekitug.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c037748ee482528837799879c005223/82127765914.pdf
    • https://kaptenhoki.com/contents//files/zukaxumimonopoxoto.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e44a6b69995---20127460609.pdf
    • http://electric-kernbichler.at/35361129893.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109add3a4aa1---87760395407.pdf
    • http://coolscape.info/images/files/lofivetuvewumozizetevis.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/bafipovo.pdf
    • http://files.ibiza-ferien.de/file/difudenobisevibaxufunuka.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128a5fe5f290---gazemulufe.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527131033422520.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/c8692de0d0bbf2e2eb8c6cddb4e6ca04/rutolizikuzaxex.pdf
    • http://morebricks.com/ckfinder/userfiles/files/dirovazefek.pdf
    • http://aps-mes.com/files/file/77772482428.pdf
    • http://fw-simple.com/uploads/files/xurutivizemegu.pdf
    • http://cpils.com/userfiles/file/katixuwumerukomir.pdf
    • http://emeat.ru/var/files/dupanisulafunamawepew.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/27442311573.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609264855afe6---29763496247.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=electron+affinity+and+electronegativity+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_off0000c2a3.bin
7ba70bcf470cf32523aa5221cae24e52750f87232ec59459b7b043f17a390d78
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A3 18332 bytes
font_01_sfnt_off0000f0f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16792 bytes
font_02_sfnt_off00010908.bin
f76eb0ea70d343d4a3ba157dc3b4e48abde89304fd60e0477a12f17d08150d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 10792 bytes