Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f1ac02054bdca8…

MALICIOUS

PDF

77.6 KB Created: 2021-10-19 00:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16fbabaca1045e3f0413c4b5eeb77e9d SHA-1: 017e8a0938105f3b4fa16c01a5528508745a35c4 SHA-256: a3f1ac02054bdca834d127cb2dec1322d4022a124e52eee0729a6af8465d2b81
126 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it functions as a link farm, directing users to potentially compromised or malicious websites. Specifically, it leverages compromised CMS upload storage and disposable hosting for its links. The ClamAV detection further supports its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4400

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ddshower.com/ckfinder/userfiles/files/kifubofumadegajej.pdf In PDF document text
    • http://anhhieu.vn/hinhanh/file/piliruliw.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/1afef17c0cf6ec7037671804a941c43f/neguwawu.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/75504146159.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/surepogararuvos.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161514c399979d---kalavutiridafew.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/5596241925.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/jodoxuralirote.pdfIn PDF document text
    • http://villkasz.hu/editor_up/mazepolakuzesekarafikupu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/tuxumubevolajudivuvori.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/fasesugutijanadupune.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/82739682857.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/43553258377.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/53216185072.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/kofaporutodopovekulexog.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/5607442309.pdfIn PDF document text
    • http://newo.ru/files/files/rubiredul.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/85868591714.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/84228241458.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/tipitivivexulezubuxad.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/7650549372.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16160fc2ea0e05---tuselowovuvitigofivuseza.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160f6f45be41---wanifimepiwawevufikipeb.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/27583284277.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/zomosifo.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=how+to+write+a+dilution+factorPDF link annotation
    • 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_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10480 bytes
SHA-256: 402e73baf9f36b73339ea4f2f7ff73ecb124afa5348b591c4e2e5e012712a9df
font_01_sfnt_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 18032 bytes
SHA-256: 1670b56fcd5a65ddc83da0e08db439cd208f060970c68c74c57844100fb7a7d5
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1