Malicious PDF — malware analysis report

Static analysis result for SHA-256 1baf2a9691b70fb5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-02 04:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e11a704b6c98842e47b6ec0b7d8e1f77 SHA-1: 0d1dacde927bd10617e34dc2c604ec88b1a341e6 SHA-256: 1baf2a9691b70fb50d2d624c82e201dded51481f62a40558bd70fa0f4d32e733
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://tucarrorentacar.co/ckfinder/userfiles/files/gifomudotufijogin.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feda048fcda6d7b834d03fed61a4342f/97655407145.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4280268322---boretuzafaxuzipekigas.pdf
    • https://akrmedia.no/ckfinder/userfiles/files/bajukekagimiko.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847cefa8f71---mowagavoruvujo.pdf
    • http://lab4050.com/upload/editor/file/supelusolo.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab65218c803---tavoxutilojitot.pdf
    • https://bamor.org/userfiles/file/tivemiwatapamefizix.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/01eeba5dfce6449b95a1793db53e43c7/67034964498.pdf
    • http://vasamo.org/pds/userfiles/files/lifikizutolefoves.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3a433dc16446e736ee5066accba316d8/wazuguziniki.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3286f679a75a799a9370bc2171ed2a62/subofawaxopemidid.pdf
    • http://flooroverstock.com/admin/userfiles/file/maxojij.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d57cd2ab---topajinuxikamopijoxut.pdf
    • https://mecaniquekd.ca/upload/file/tuxugik.pdf
    • http://asupuro.com/user_data/image//file/85194432648.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/af4036bba9e59ccbf54d1b1ce0d9545f/49696112437.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/47bgeivkul7db9gh3iha3j7gom/rumawabisex.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6bb5377f---58782659833.pdf
    • http://nfraccon.org/userfiles/file/kumupiluvidabowikagox.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/mezagonigenazumeve.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9d1b9c082---tazumipulok.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e3fafe4bdfe78085cda9d95e4a603ce/15770086726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=law+of+exponents+division+examples
    • 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_off0000ea62.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16792 bytes
font_01_sfnt_off00010279.bin
f341c15433a3f66dd78e4ebaedb2c94673805d34e4bfc3ad0337fdcb0a41b51a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 10772 bytes
font_02_sfnt_off00011b51.bin
04c6172fbbe9309d22dd4dd534d63f2801890da40d527160f0cb2b745f37f545
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B51 18028 bytes