Malicious PDF — malware analysis report

Static analysis result for SHA-256 692c357ac2150f97…

MALICIOUS

PDF

86.8 KB Created: 2021-09-19 03:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 135a5dcedb69b27efa341884675b9990 SHA-1: 491a101bd1b4d379d4efb11121115cbc26e85c8a SHA-256: 692c357ac2150f97016bcf24b796cc9393336ba2e259e0b9bf94eaaade8e9f24
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, characteristic of a link farm used for phishing or malware distribution. The presence of these links suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://zhjpharm.com/upload/files/40021450106.pdf In PDF document text
    • http://dotbamboo.com/file_media/file_image/file/9412409544.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/muluditobuwepaginurarevet.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/42978928620.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/32371269639.pdfIn PDF document text
    • https://limadelimon.com/images/file/merenunilexemukoto.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54642630465.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/30412009600.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/94874549082.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/78593531848.pdfIn PDF document text
    • http://cpviettin.com/upload/files/58106018230.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3ec1ae86a88e3deb8ac55f5362204d87/79466401561.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0df7c71e9---83867985739.pdfIn PDF document text
    • http://rsst77.ru/upload/files/95848197384.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/bukibakugokajajisugajim.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/60093348696.pdfIn PDF document text
    • http://christopherdallo.com/file/29768483993.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/kapuliwixuziw.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/varulaw.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/retozuwukes.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/depukiroxon.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/55641178988.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/9mml4aj3m7dba7ppoev2ll2k70/zipaj.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/95930849602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=live+football+tv+hd+2021PDF 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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FB 18376 bytes
SHA-256: 4d2383011803cfefe7c521cb69498e047ab050be83ee3dde7abb22ce2822d90c
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10536 bytes
SHA-256: 6b06e99b4de6791b467f07978b397ddfce91bd9f9f67d8753ed885eac845841c