Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43437f1bff71de0…

MALICIOUS

PDF

71.3 KB Created: 2021-07-15 11:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7da0f50209f3ab4238dd7420965439e SHA-1: ba228e685ca06526e9d7715fbd047a4b83e088b1 SHA-256: f43437f1bff71de05715934253ab42c37812e467751bcd1af5e6f2184fe77db3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5394

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://garglob.ru/uplcv?utm_term=robson+green+extreme+fishing PDF link annotation
    • http://skogsformedling.se/bilder_umeny/File/32134714335.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/kopofaxalutumedimubudiz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b3f6c6481057cfedf5ba025d7e1b447c/filexemigewe.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kuzifufasetafumetikapuke.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/pewetaranexilab.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/96774421969.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a500da34450---73221778578.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/zofiwopimo.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/96088674940.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/5116994568.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ijok876pqnp33pbubm71snsmr5/xoloseme.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d62a0de3127---vavekupar.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/91514741096.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/5138760990.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/6d8d9fdd8be46fbf6d7149b4c7eafcb3/84427608773.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9fcd1ea1b---tixidarudaw.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1f3cdaaa---xinuxovi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01417f7d1---femigevozeginakafutag.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3016dfc3fbc0803f8f5d59a1a6f00134/jisisotodakodotenabewoxa.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/62f207559a34905f15c68e18df471616/mixiguvowijexasonekiperub.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607057315570d---35806261600.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/722db96dd64f08181448977d310b5fa6/2081620822.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ae54ce850b870c66434cc9412191bbc1/75746960534.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 10740 bytes
SHA-256: 9d318f816f526f223ef592b29af7e900d88a7e5fff30a0c4d0f4ae7e9c632379
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1