Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9d94e7a9c5a070…

MALICIOUS

PDF

79.8 KB Created: 2021-07-24 07:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 635a790171b78136837b8ba220bd9c2d SHA-1: 16d9b9dd0421a97a82b0010745c9bf109223be6a SHA-256: cd9d94e7a9c5a070358213a1687013f85e8352cbe8039d64f41c08f1222daef8
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://ncdesign.it/userfiles/files/85965311827.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/pofalululirepefinivalolot.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6ddc1f2b---79553780031.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c2fd44cf---1806660500.pdf
    • http://bassbasement.org/userfiles/file/girimaxogikubaror.pdf
    • http://hrt-foto.hu/_user/file/81644824371.pdf
    • https://nanyangtextile.com/userfiles/file/wulaz.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0eb83f546---mepedus.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c06468493f4---80452415589.pdf
    • http://energo-winstal.pl/userfiles/file/27715971056.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gqp32pk11hottm34r0ru3vu6tg/1390167417.pdf
    • http://dentherapia.hu/files/file/towukenabozejatenad.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608668de57e85---tamil.pdf
    • http://riph.pl/userfiles/file/68647809948.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5252c3727b---4200341607.pdf
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/5765636896.pdf
    • https://mallncart.com/userfiles/files/baluzezovofixisetubur.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37e86b5aa2---5553371823.pdf
    • https://menu2uplus.com/images/file/pirapeniwalorabiduni.pdf
    • http://119pump.net/d/files/xudesaw.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6a5ed7fc---14345355874.pdf
    • http://appartenvue.net/appart/upload/images/jewemutiwagowoluw.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1eae1327dfa6685554c88e71e255e314/96028445458.pdf
    • https://aduanaldelvalle.com/userfiles/file/kelivimi.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bcp4t7jh99nvrah1jb06cddrd/77864026757.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=europass+curriculum+vitae+pdf+download
    • 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_off0000d16f.bin
f51a7c1d261455b0c9706ee55a4afd27c8f3fbfc9640de4cad3b2cca5a0aa28d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 11016 bytes
font_01_sfnt_off0000eb16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB16 16792 bytes
font_02_sfnt_off00010328.bin
68f4cd9034b14b041310044f003a0f9a2c44a3ad96c3291056bc6791ec87cf5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 16884 bytes