Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2dc91c574bc5de9…

MALICIOUS

PDF

84.9 KB Created: 2021-07-13 15:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4331bc6506995bffa5aa083d6b1e9e15 SHA-1: 97922ef2a221bff83374243c0934784158f12c50 SHA-256: e2dc91c574bc5de9d575bdc6c86e145a41ab2218181bad1df80ea30a17274701
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of distributing links through potentially untrustworthy sources. The primary attack vector is likely spearphishing, with the PDF serving as an attachment to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://zdravi-kromeriz.cz/files/file/pidoj.pdf In PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608242940f7a4---wodufawemunaxagagilef.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/zitasugureparadurafe.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/54437258057.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/gf96hd75sdhuf05i3gr8kg7sj0/52419669702.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/99d9ea29865b85cbc3dea439b5365947/88296667667.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/joredepinogigasajek.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4nf3d604dstk5s8cc3kb6kq0b2/70292439842.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/38558435014.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/50a5d780db341f62012052ac948f54b5/sakuturofilus.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/5a21395465bc3fc96ef660c49ec33551/32999996175.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/nikumofijujo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/35576492316.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wizutifijuzotixetoroxen.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da0a3b583---41575406173.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mozedugosot.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/cd61b7a846627a6c1fe577590ee19394.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/49779405837.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/xogeviwedig.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/42eetcubm44ad7niqolj1p25v2/zanusakipexevefiromunefaz.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6558988210---30045043010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cleaning+agents+in+housekeeping+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C9 10900 bytes
SHA-256: 6b716909f041034cfd1f494d26a09ff09620188b3cc685d37208b9075a5b1dd5
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 16820 bytes
SHA-256: 8071c9ee9d73a6ccd802d688e9b5d1965b0f9adda8395f2535b4941cd10e2e7c

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