Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae38728a61cb718…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 17:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2299ca62816fe816cc239c50a4cbb4e0 SHA-1: 184f3a9ae22e9bd4ef2e7464383244b24897538e SHA-256: 9ae38728a61cb7184057dd95c0804e124c8f6f12092309cc36a798e25efb92a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://dakhoathienhoa.net/images/files/nosera.pdf In PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/d9f1915d33e55b0d5ce2a1491fdf11c7/59082164674.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10514375971.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/vakeso.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/kofusisovunugadaraj.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/zapozuzofuruma.pdfIn PDF document text
    • http://dalaichau.com/files/zoduf.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/98a7ad800d37671905e5590bb9a2938b/wolegulegiputow.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b7859bae7cc87390de1e38c96e17f9dd/80001316812.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433e4ec69e0---gijedoworofisefejibusesa.pdfIn PDF document text
    • https://langumeistras.lt/i/File/83754022085.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/mozir.pdfIn PDF document text
    • http://retailcop.ca/files/vedifiwu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ximen.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/06b5bbe7de1b596b1a422195e978a683/71642881766.pdfIn PDF document text
    • https://isosklo.cz/uploads/16361152358.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/fobigerasuvejokunawodi.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/44762910180.pdfIn PDF document text
    • http://spiregene.com/image/files/20210910_205126.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/metolapumanafowuvujer.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/12245051902.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/pajokewininusugogos.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/58629056347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ludo+superstar+old+version+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE5D 10688 bytes
SHA-256: b8825624c0f6a9a1df6a798d0fd5f456c61b87714f966fbd92f0e655a1bf36a8
font_01_sfnt_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 14652 bytes
SHA-256: 01bbc75d31faa69648c1c4de0a6d8ab2626b6ed7b28264f554970ec5288e5884