Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7abfad4a69b057a…

MALICIOUS

PDF

76.7 KB Created: 2021-05-03 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2020984c57c145a1ccb89c4afda44a6 SHA-1: 7acb233e6decd67b0dd7e649374ce4d2e84d66f8 SHA-256: a7abfad4a69b057a08a356b895d347cc10b2d61634ebd64c4b0d65230baa992a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'Nattakom full movie telugu' and authoring information, suggesting a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c02682acf39926f616725a795df5a56b/fukaruxixejorejava.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb06d89d3---madorigunuvenatiribiz.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b7814fd9d78c3cfbe8fb719c17578832/zubugowore.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/de0a9987237ef25e326f0089005e387f/bexagugenonunowex.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6a0e391f7bc4cc5baaaf127a1a499431/84014004311.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/87848d1f1e4da2a0235f474200caf862/siwomefalazomipurez.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608192fed1c0e---18774678495.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/fcab296c4f05476c5885cc91132dfe98/sevow.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/fko3p0hbkmnu9jiu14mkfv51t9/mufewatejazoletew.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/553d9b989fdbaddb637d351152c8c4d6/1356420640.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/88195625685b43be152207b9956c62f9/tudovifunoko.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4d373cdc7---xugejowiziwo.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b9356b2549d48c6d2bc2a51f96530cfe/rabumobelizonowovonaroni.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c5b2ed30377dae11cc2637ebf8c5a71/96385931869.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b6fdafc2---84876985757.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ejmahbecenbuuh1oct5qcn1j21/sitipekipifurujoxoraxezax.pdf
    • http://aggengr.com/uploads/CMS/file/netunebufivixiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nattakom+full+movie+telugu
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06e.bin
c22617d4a2a73284e4533008b5a8300f494cff9ebc353706dcaa962ed42a33ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 4904 bytes
font_01_sfnt_off0001012a.bin
b91a6c1f88794c070932543ef72916cfc2d781be8942763817588d15507a4f9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 10716 bytes