Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2c55026b0027c59…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 04:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cbdaf06753dc8d7477f23ca09b4ec32 SHA-1: 8c94cbef1d6f23fb3d19b446900381c47db8c271 SHA-256: f2c55026b0027c59674eb6d603782447246b56057696422219efb5109c7718be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on domains identified as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://darec.sk/files/files/vaxatoxutubiluke.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/liximukewi.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/besilesipum.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/nisidikevatoribaro.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/88518299927.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/56cf73f7efbbc6acc92d9930dcabae1c/zevenamofikisosedig.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b02da27b---japovafukenikozek.pdfIn PDF document text
    • http://standdominica.org/files/files/47922771317.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/24610711151.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4e5c2411---65358098330.pdfIn PDF document text
    • http://innotack.com/userfiles/files/64990080840.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/37900475171.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109052034246409.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/53994900742.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/nutojidilik.pdfIn PDF document text
    • https://banghenails.com/upload/file/subodikarivomexifutuk.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee603e78388---19467584696.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/boxijidefisofusogofapabuk.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/duniridanetanigi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9b799435cdc3225e997272fd2149d5a8/97213636155.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/zumaxo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/67f34ac74ae7100f82e41653525c1069/wodiwotemedega.pdfIn PDF document text
    • https://melz-feu.ru/upload/pazimox.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/46592555613.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/podilen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=conjunctions+and+interjections+worksheet+grade+4PDF 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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 18308 bytes
SHA-256: a374df0e8dacc5328d8f70cea192f1cce46db07a2f78edb8411cf19d3f934f54
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 11120 bytes
SHA-256: a2b68ff31fbe40ec05f2aeb875c59a15a13dd81327d2fbf89b2dc916addbb1b1
font_02_sfnt_off00012381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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