Malicious PDF — malware analysis report

Static analysis result for SHA-256 522406bf5f821e95…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 19:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8c445a21239ab90d9ea8cdbfc5937ee SHA-1: 876d21e0bdf62b85967380f674fc3fca6c34d386 SHA-256: 522406bf5f821e955751b6297b31f6611d4d8a1918ea0b88820d946733dada43
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d763abb44---bigosifa.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aq3vfjfjprnshke1a2c95cmuhf/vapatujurulonaniwomisi.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a3b138354---29515345227.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/63127181065.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/sufadaxonezoxex.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/j0uhu8i5mdjlj82nq1sbil58um/50641699157.pdf
    • https://remoteyourstaff.com/calisma2/files/uploads/13999421802.pdf
    • http://ettermanenterprises.com/ckfinder/userfiles/files/65339270307.pdf
    • http://work4shop.cz/userfiles/file/pidopatox.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072d509e689d---tufuribaleli.pdf
    • http://sva-jeanroze.com/xmedia/file/wawolab.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bndf0pklnnlrae099a4b7dmcc0/55328850591.pdf
    • https://genericdiabeticteststrips.com/userfiles/files/xuvofutanikogepigifetuso.pdf
    • http://playeasypiano.com/resources/fck_images/89506125355.pdf
    • http://global-insurance-broker.de/downloads/18520626517.pdf
    • http://szentdorottyapatika.hu/files/gavasogaloledimabulu.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1cf8db387d1d3cc8fde3b822e6d2489b/97040142279.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c024a4a25---16351116015.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e275e5504---50087488962.pdf
    • http://stellamaris.cz/userfiles/66948811049.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4e57ec6c0---91133237701.pdf
    • http://sattamatkapatti.com/userfiles/file/48873231206.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/7dd8noegp2pf7569rpvs661pd7/80704740438.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22eaa0c0e5---rigofuberogexowofuv.pdf
    • http://caydinhlang.net/userfiles/image/file/durolebotimax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=highlighting+duplicates+in+excel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f435.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 16792 bytes
font_01_sfnt_off00010c4c.bin
007aaa0602c6a0945d3d60a451c929853dbd6d0e9acf497302b5aaa562c0cc83
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4C 10764 bytes
font_02_sfnt_off000124bd.bin
04420064500a01543a7ae8912cea4836a9cbf4a7c6b161055da7fe0b472102c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 16880 bytes