Malicious PDF — malware analysis report

Static analysis result for SHA-256 6966800740aab7db…

MALICIOUS

PDF

87.8 KB Created: 2021-07-24 21:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f92a5df8b150a108e36dca91b58a7164 SHA-1: 5f3f9692bc8d5826d54523a559b8ace83fb3621d SHA-256: 6966800740aab7db74c127b8257e630df2ebc0f8337fe5896d402a7b55696a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5cc77690---nanizomokopotifakizu.pdf In PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dd55b64---85541321768.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fbc405f708b83dc24f03373ae8c01cc8/ronarop.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fbd231ade---77452213702.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/puvupekoxarusid.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/84018576994.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/71321876285.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/33628749413.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37447115a3---7922670873.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zotilenawovoro.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/pomenixen.pdfIn PDF document text
    • http://kotolantopeni.cz/file/53740687462.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/tcve446ltplp5bj9hi6de3ph5s/moroketinejenonatami.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fb455a376---71751689886.pdfIn PDF document text
    • http://zerosquareonline.com/file/84027863830.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/j1qtp351biv84921n458mc81aj/mizazitotukogiliv.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/csu93usr3t91uoif9sbbcq0l52/96399140590.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/81231061765.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ruxomabo.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/bunuzelosamebived.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081843a9fba6---xaxukuxusosavirupiwe.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77128131482.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d84ddd501fd---pewilerotewipisawuturikot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=hp+photosmart+c4580+printer+wireless+setupPDF 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_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 11360 bytes
SHA-256: 5f00ee0aaf0068c2854c7645140bd0bd80ce97d8d01633267f5a1dea07eb07b8
font_01_sfnt_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 16664 bytes
SHA-256: 243f4536209f0992eb121b50e68f0197cf5c21a0079bb5553c2f15a780d0574d
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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