Malicious PDF — malware analysis report

Static analysis result for SHA-256 c20ad88d6594380c…

MALICIOUS

PDF

84.9 KB Created: 2021-09-04 23:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c6b72b8b2c727c21ba4d8918aeb7be1 SHA-1: a301102853b5bfd8bdb9f87eecdf057fd95f0592 SHA-256: c20ad88d6594380c5919213fba1638b6e0e2436af4c51f10def6ce0fde21be13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of multiple external URIs and link farm indicators strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=cemented+bipolar+hemiarthroplasty+pdf PDF link annotation
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee372e376---21907850679.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff469326856---ragijus.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdb1a8bb05---puxutaxutason.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/19965446262.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bvbr82otq6ott20tg2lrrssmdf/69875960590.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jujatanin.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/magovipetezavidatan.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/sivetejiberaz.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/34938891382.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/61ac7528621ca547b19963329756a028/84556705156.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/kekuziwukuvujifise.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160836c5576357---vuvemijorupovu.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/doweros.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/xesisigoruralosiko.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/15279115922.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160711307c1e4f---5588204639.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/xavapodiberedasegumos.pdfIn PDF document text
    • http://fedoro.ru/upload/file/57558744482.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/0f47cab75e54eb75cca2787c790f11b8/18956798141.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tobetelixawume.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92389e846f02cbc46772da64dc549474/gutaganinawe.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/pezigubiferezulodejebamu.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/6420498483.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/gexik.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/28157706236.pdfIn PDF document text
    • 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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 18148 bytes
SHA-256: 91949be26a4abf1c433b81952b65b3de8e90e1159a9c215f4adee8f8c48ab9d3
font_01_sfnt_off0001143a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C51 11048 bytes
SHA-256: e1aec1470dc9438807e480fe5c60cb2979e922245fa506b421be66b59a347af1

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