Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5aa1ed3b92dff3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 09:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8374aea48034abaca773df532dc51681 SHA-1: 6deddce0637beceb56aa790bbdbcc569395aed55 SHA-256: 3f5aa1ed3b92dff335f5c7b762a43398c7b5206f3ad5c225370b3df83dc5c05d
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to lure users to malicious content. The presence of PDF-specific heuristics related to link farms and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://euredit-editions.com/userfiles/file/zaponu.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/48464067694.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/0iegdkthq193e21uq1tf25ssj6/doxebo.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/9229689267.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160701f1a4cacf---tevodepurelegu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b1308fedd---tosokanitebika.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/06800a3ad2a8886e5ae9ca182b896ed2/56887207063.pdfIn PDF document text
    • http://liyangah.com/Upload/file/modaduzifunewipo.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7ae6a9f37a2a7bf06688c21769f6002d/49061148580.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a4464093671---xisexusibafozetexerak.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/75665883615.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/zavozapesirexejiviwisexan.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/nuzifisipenebolumejiber.pdfIn PDF document text
    • http://seamacros.com/upload/file/78195454127.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/lovekufidufisavikagu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad721289f1---76839280784.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/89014787287.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/noxebibuvawa.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/rj694aqjekfa841tr62nnsesdo/medoxutara.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/35127382190.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/3625691085.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=canon+t5+instruction+manualPDF 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_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 19656 bytes
SHA-256: 3643446f470a91a5195415173cec269cd56c139dd4cb7ec54bdfae1b43add1fb
font_01_sfnt_off00011263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11263 10524 bytes
SHA-256: 676adf72ef9482ba69c024bdb95486cdfdb0f2b80fd80a771e45cd503a523c0c
font_02_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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