Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4b709249ef6efc…

MALICIOUS

PDF

88.7 KB Created: 2021-10-04 19:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 045cfd883a714dfdba0676bcfb6c42b3 SHA-1: a7defda40dbab61ca9ca5d1fcafa7031a8b12988 SHA-256: 3c4b709249ef6efc8a752c7ed82d6b8086a5a204d562802ea377ce6b2cb9dd9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=how+many+1.25+oz+shots+in+a+liter PDF link annotation
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/sotukomovotadikepuba.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/somoviwuviruzoxijuvopa.pdfIn PDF document text
    • https://mollis.rs/files/kajad.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/6263369470.pdfIn PDF document text
    • https://avela.md/userfiles/file/libezoxowamenidu.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/podaxini.pdfIn PDF document text
    • http://enricobarraco.com/files/gemaxili.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905074620.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6485b832---20661285774.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/robepevuxitex.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/sulinulewazilebobixajubim.pdfIn PDF document text
    • http://dalaichau.com/files/27768256442.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/87257684967.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/91457019159.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/40287487263.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc624d19c---fuxafi.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/22256698935.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0924/56ac8791e32250f119795f4020b140a6.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16154059ba8ced---fafilor.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/tobukitikumepodinuv.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/nojisafajigir.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/titobulaken.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff8ffc4f6b---jumejuwepejoxapepafiba.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136f812d1823---6158709599.pdfIn PDF document text
    • 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10996 bytes
SHA-256: c54f505c217f7276ac4282cb408567bcff35aaa59c8cc50eefd20d1a53fbfc73
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 21320 bytes
SHA-256: c6d30a49d2fbbec50fe43d3aec86fcb5176187cd350d07fb9d2926d61df52815

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