Malicious PDF — malware analysis report

Static analysis result for SHA-256 735713263b433c5a…

MALICIOUS

PDF

101.4 KB Created: 2021-07-24 13:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6e420ec26641c9060bbad2e73257894a SHA-1: a03c2d679e53e5efaad1b9468aeb3959ad93cce9 SHA-256: 735713263b433c5abb13a231a2c049ccf85e4f0e6cc897f85e0b75595729e08b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to external malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://anmoul.com/userfiles/file/40701417077.pdf In PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/4cd2367bbd5bcfdd8371fe3423cc9ea7/3343622797.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf1727e728---wugisaxi.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/73118598707.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zujafowabefiwefa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dotalezokawini.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/xaparapumofaxanuzomov.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/14197927701.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/repabuxepogoxunomosinex.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/93383495219.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7a77d79fa---87171283922.pdfIn PDF document text
    • https://digireg.gr/upload/susabopi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/89176223586.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/7950436498.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/ruvebojowetelawoki.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/76066030870.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210702151601.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/b863cvpp4bpumel9apsfu8tah0/68729669895.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8232a81a15---3352757076.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4810ebbc7---82276690089.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/rovidaxexobowefat.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/powasegu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c91089bba---52978482431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bhairava+movie+songs+in+tamilPDF 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_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14345 17360 bytes
SHA-256: a7787817d431144017ed1b2bad6c25404cb17db386f591dc5b135ee7171d5676
font_02_sfnt_off000170f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170F5 10676 bytes
SHA-256: 44ea81ee71e51eb77af3c4998ed948a58296beab7cc86c0c0107535fdae0424f