Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168d8cfa5cb2b7c…

MALICIOUS

PDF

64.0 KB Created: 2021-09-16 12:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ff27d82d77d2885289a1687e97314c8 SHA-1: 131d50e5f036063adb4a2e4e6eb70541836b41c2 SHA-256: f168d8cfa5cb2b7cacffe3b6762ee602daff191a65701926ddf0faf49e9da210
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 5

  • 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
  • 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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/267f32a90888dfcd6540a3c923407bdf/54131479256.pdf In PDF document text
    • http://poexali.org/static/image/_u/system/files/mejofuvowekul.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///68451508573.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161310f14182d3---lamakipipakuzerolon.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/05923779a9b66c6bbbdc8e7013ece98a/39421973585.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/tedixixibaga.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/aadd2rkr4r8qjneb2gcqr9refr/82019491415.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/xigupojovawaxipasudobemu.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/vupewamadok.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dovota.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/7414851557.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613515cc532e4---mumupod.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/niwukawegowogasoxaliv.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/risemibozekenuvizixi.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/jadirutolenopuguge.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/26784566980.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/rutoregeguwojuz.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/6451851840.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/bowolijuzi.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/xafuwevobepezodavazugo.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/periga.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/neruxebinebopateredopewi.pdfIn PDF document text
    • https://steammining.com/userfiles/file/81542675110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=javascript+complete+reference+pdf+2020PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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