Malicious PDF — malware analysis report

Static analysis result for SHA-256 f450911bd40f9f05…

MALICIOUS

PDF

62.3 KB Created: 2021-08-30 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a3cbb4a8eade6df0eaafb90c4399ec7 SHA-1: 72c50d0da54c6672ec725fc0ed52be13d34533fe SHA-256: f450911bd40f9f054e71812ffa65617ada9ee935ea6e1cc1886d28062290232f
154 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users through a seemingly innocuous document to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efd41b2544f---85403375520.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fd890147c2f1df427f7828167492b7d4/fuminaxelim.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/fasiwuxexegikilezegodeka.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/32382767811.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/pologoberisenobo.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/nojiwazo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/fugegipebot.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/66s14g916m2mvs3sr3cjdmnlrc/81308644479.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/milikigebixasokorolizanu.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/94835825724.pdfIn PDF document text
    • https://limsurempat.com/contents//files/88995436717.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a638c61518---bosusijonesuxa.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/dezox.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/87111577467.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/88375438547.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a976ff19b9f---turefixi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/804397d1caabf58e6416b7b938a77be9/54714998439.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210822070456_yooudo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/zonad.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/6505322055.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a8e15b9c2a815bcc03678d4ac50ca44c/kefixedejebupovumesazobez.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/tozoxobotaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+train+puppy+to+bark+at+strangersPDF 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_off0000da8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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