Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c8b27b1fc9e119…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 21:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 708f50b288fca72b2bb823467158f595 SHA-1: 1a1f1c8692b8f5557ef86e62a608061da5b9c5c9 SHA-256: 35c8b27b1fc9e1195b6c2d8f9a2938384315afaa6dea8b7a00b7bbb5f2562061
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://limoride.net/gallery/file/76137500112.pdf In PDF document text
    • http://poexali.org/static/image/_u/system/files/10222231128.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b331d11be---58823223781.pdfIn PDF document text
    • https://mmszke.hu/files/file/8398190664.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609448358d3e6---49328478218.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/4534755321.pdfIn PDF document text
    • http://identik.hu/editor_up/xekag.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3bd0368d4---53894879402.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/h82duj5pidsa1jcnbq7k6lbnma/zetikalumib.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/16924713239.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1f65b1cf---18687994567.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sajonewax.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/31311332860.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d864e54057944aef83a921d8d2618579/21238781439.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd04be14c2---13846287723.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e67d5351e03---xisijawopamoba.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3ce579b60073b8b3793b59d27cdff1e1/33447183999.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4376f72816---23257735785.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/283307e58e17ed14727a0cd8bf84b81f/89207006409.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/44229681411.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/98767775143.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720fc15543c---36129407548.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=engineering+economy+8th+edition+solution+manual+chapter+2PDF 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_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 11488 bytes
SHA-256: 7ddac5db51dbe8d22592fdd25021f718d4ee60686a3dc9d9e2fd9e69246ba025
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 18572 bytes
SHA-256: 7daf609cc8b1978d2c07e08d39c65431d787e16f73f575b648898b1b520c299c
font_02_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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