Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f6874b042db2ab…

MALICIOUS

PDF

81.8 KB Created: 2021-08-17 00:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 970c96e3b90dc3b6eefb836b2a9c4247 SHA-1: 8d6bfd469e62db29b4a4abfbb22d76a1fdd072a5 SHA-256: f4f6874b042db2ab14d859babb63997720521912759df60b8be8226cf4cf9d97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=what%27s+the+best+sofa+bed+to+buy PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb91c7147---duvikufag.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/1kb9q59lghspp2us9lsrruves2/burutinemuwituwilipabi.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/mowakugilakura.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/f06im3bc7bk1s2sqrvmkv83ol4/dofapiwoxizofivanuz.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/92489602369.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/xitagobotowalinuvomewev.pdfIn PDF document text
    • http://asfalon.com/__files/file/barukudusagew.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/teginuvomes.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/reburomekasuze.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2aabb427---pibifawex.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/20081221584.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/e1tia23v9610kukmu1kgqdtujk/gitojudejabon.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c473867c8df---93489853559.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b66f2fafc42e34b553ec19d1eb5bbc6d/49340285004.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/rolaxuko.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210613_25F1645CB2A524BE.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16271585962983.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4a8c13a0c0a3d25132b65e51fc6e2fc2/wifemuriwadepibapemeno.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087af0ba93fc---2721894243.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/93202682737.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/97487266128.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/28eb09d35a869528b3933b6087da31e3/9371763743.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/47063683255.pdfIn PDF document text
    • http://runo34.ru/attachments/file/83607017187.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 10488 bytes
SHA-256: 35a0aa1360d081514f2e302d55587ccc6a6b94a28343764cf7b443f604195466
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16400 bytes
SHA-256: d8bfd9c3fd45b1ea9a092a24f14f23f05729fcce30f3132723f5d79eef2d7179

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