Malicious PDF — malware analysis report

Static analysis result for SHA-256 c354f37a9c3c7ebe…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 00:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6932c68524bf55b3f7bc63213b2949b SHA-1: ab70d8539a780d3c867760c0a20be54c6025a45d SHA-256: c354f37a9c3c7ebe0d5cb31b2029914944b1853db4fa72cec77b42b76dcda3da
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pistant.ru/uplcv?utm_term=dyna+glo+kerosene+heater+owner%27s+manual PDF link annotation
    • http://kovovyroba-nosniky.cz/UserFiles/File/19674249051.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/batotuvuxujagejepu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/26922427915.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/sekilevebejilupazujowa.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9c41489afe0c77b581d16af1b5cf37b6/dejadobojipinogejewute.pdfIn PDF document text
    • https://sealskinz.ru/files/file/81993542625.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lebadojanonuro.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16093ae79071c9---vuvijumiwavuzone.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/26013815886.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/e5b77577edcc6caa60fe362375958297/53878012940.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/78012107169.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/bed1ac7d15600ae8f3f8129ae29c8bc0/zosifiranamovapadasimi.pdfIn PDF document text
    • https://fasleh.net/Files/files/maduro.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88587b68b0---motexumun.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/871998048.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/3ab25897614c58899faa9c1d8b77ab87/98547178691.pdfIn PDF document text
    • http://ruresept.ru/files/file/norojekovugokuboravobe.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/88451229695.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/39237291377.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f266102e5---69949172135.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/bifafujakuvuked.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26332dd91---juwom.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_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10888 bytes
SHA-256: 9eb06db275eda3b598608dbd4adbaa24c8582791f881ae5d06c753daa293da88
font_01_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 19392 bytes
SHA-256: c0b06d054a78d3655dcc9d61f37ef2509a6300849212e9e6b55cb99223710fa5

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