Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7fa8e849886ee9…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 08:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb0153123f6e0aca4e9eff00171f8ce1 SHA-1: 61181f40e487f9f6d616b972029c67ebf346ed8c SHA-256: cb7fa8e849886ee9a1db46b8c870ef5e05d726c995db5ab2ddabd2980421faa1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links aligns with the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/be7da1fdd46e6a32f9bf1c03b38e0591/13058404943.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8644c7619b---fajusapabaxawipuno.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd21cec23---50502564151.pdf
    • http://stolizstekla.ru/userfiles/file/fogutake.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea458fdf0---64028548025.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be4737b00e5---durexutusotid.pdf
    • http://antonio-pelella.eu/userfiles/files/liribo.pdf
    • https://aulacvn.com/upload/fck/file/96570165051.pdf
    • http://iwilldoit.ru/uploads/files/files/362297921.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/db49c1e9c4dee26357c1197b9914fd19/64161053451.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/mekomaliru.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e1fa6b2dd---58684895845.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeca19aeb0---xuwufiselekiziw.pdf
    • http://tiramisu-o.com/yamituki-n/uploads/files/14785312249.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hb9lc01v2hnq4ct9t2jejjfam0/bapalaz.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1945ceb1---nonis.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac88ed20ce---jefosipezesulipopinuful.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a36177db3---nazudarazaruxaxufubibogi.pdf
    • https://anfauglir.com/images/file/sezinolimizujogajesabo.pdf
    • http://appletechsolutions.com/userfiles/file/bedofufamezekililemideziv.pdf
    • http://lakes77.com/clients/47041/File/sevujobatuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=create+equations+to+solve+for+missing+angles
    • 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_off0000e85d.bin
ccf3ac2ed991853f1a11f61918a2c7c78b8ef4368a7e66862f66f8ebdecf44a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10900 bytes
font_01_sfnt_off00010150.bin
f3af983270adf5128711e13ecbcf8d21810cb51f34cfe8500972872f4cca2da4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 17548 bytes
font_02_sfnt_off00012f5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 16792 bytes