Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8aaff4e7158ead…

MALICIOUS

PDF

88.6 KB Created: 2021-10-10 17:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e5ea67f4d34d28d0b45df4d2ea4ca00a SHA-1: 5d6aca820f3dca2292df98baa9229a77c879f128 SHA-256: 3f8aaff4e7158ead8ce65b570db0ba83272b4e93fafe9fec894c4d29c5c65fa8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the exploitation of user trust via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.smpnuenen.nl/images/files/25615537209.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/33322922253.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/pajegefikesanakexejivomob.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/78995048660.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/99681654985.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/60244523950.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/18995363582.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/53989546478.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/81187782786.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/31752237473.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/vujedowizitisu.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/15156872931.pdfIn PDF document text
    • http://pactolous.hu/upload/file/zafunefavanosipi.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/vazibirobixegefer.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d6a0cb128ce50f3910483da33148b4a1/34712483922.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/jezuzovuxip.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/91397656781.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac8a00293---kebezepufalo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149e6dcae529---11075821175.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/494177651.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/70160248423.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192135312541.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/bojulazukinudalezeri.pdfIn PDF document text
    • http://uhorder.com/upload/files/15280802390.pdfIn PDF document text
    • http://citlak.de/admin/UserFiles/file/65742789787.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/xiwawasefabagafutazetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=student+exploration+reading+topographic+mapsPDF 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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 19412 bytes
SHA-256: e974abf5582956364628974892b99f49702614c63c1f5f3573c778489b34bc75
font_02_sfnt_off00013a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 11240 bytes
SHA-256: 7fd1962ea3a83a73e4a071d8818fd768621f1b56168aed97012a9e1c630582ff

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