Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6ef29c8a881022…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 16:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3594dc8ffc36a1caeeab51b26aaaaa0f SHA-1: cf2baf5fbac17cc6540f8abe6e8c575cec3561c1 SHA-256: aa6ef29c8a881022ae23fc105729ac7ce2a0af5eb9f08c92e263566fcab53793
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it is likely used in a phishing campaign or to distribute further malware. No scripts were extracted from this sample.

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://irlanc.ru/uplcv?utm_term=patristic+greek+lexicon+pdf PDF link annotation
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e42a2f64ea7aba2fd436b4812599ecab/96814575000.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tcjsdgf5b631djv1ivpg8un8ab/setino.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a7382b74---61826105504.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/4774410949.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/lidimigawinumopema.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/bibejifedabezozevipob.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7ccea90f---49896415515.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24972b4c7a---56464112688.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/509771234f78678a077c7ae1f829f90a/32620338214.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/527c5da467392fae19f6682a1c4059a0/88199594999.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/26892281661.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/roxetilo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/lagarofeludanenegabix.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/adf27ac70cc5001f09e12dbff0b1966e/29802867729.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/77db60800028db18d2793c9eaa65e784/99442350773.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16105b729a27f0---86207309189.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bumifexaxufik.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7f7f2897---17698387670.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ccbb02ee73a14307476aa66795571fab/vesifekudumibefofamalit.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9fc53f686c0ccded2e2584730f732b8c/36749981645.pdfIn PDF document text
    • http://deltools.com/userfiles/file/dutazivivalopobuza.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621605899.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/pirugilotujosunoxopisir.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/zowivikoromukoxodilunozef.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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 20940 bytes
SHA-256: 6064ddf14b998cf19bb058c5683f038518659770cefc3dae96a8bbba7c919eef
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 10988 bytes
SHA-256: ce0e9d973fb40c388cd73c06a6f2c6ff757f83dcfc212af621cf034fed522a8a

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