Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0087fbc4704f806…

MALICIOUS

PDF

83.6 KB Created: 2021-08-29 02:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e967749b5d269dc75b475ea7c44807fa SHA-1: 86c9b04884e3f09ce50525308071c2a4f0b87dca SHA-256: b0087fbc4704f8067ddb0fda80c3de5c635b9bef5a4a585ea6d397b6d9f20c4a
164 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 disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://easyreturn.store/userfiles/file/wizutabosof.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086966bda93b---686716033.pdf
    • http://indianspringhomes.com/userfiles/files/tusedazukox.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d313c4123b8bed3d540384c316677cd9/mavagikumikonemazu.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d863ddbff1---xopekan.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/9615499984.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/l56c2bkecaqnrfi7julgt1n9hj/11168594079.pdf
    • https://vannordenvastgoed.nl/userfiles/file/movikidubiliraxut.pdf
    • https://xn--nmqu14inmf.com/upload/files/sipovidoj.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d7652f74---16285735363.pdf
    • http://maryalo.com/userData/board/file/notit.pdf
    • http://artsar.pl/userfiles/file/85988251416.pdf
    • http://jandenzobv.com/image_uploads/file/16057218952.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa50139481---63839477320.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077c017a6de2---67788294787.pdf
    • http://xutricolor.com/uploadfile/files/xifevotovavojewomore.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b7d82c84d006ba624d17a2bb6f6fa39d/62986625633.pdf
    • http://www.mostenpo.jp/userfiles/files/malaxobe.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/528295f0a5392b2b1215bdb09f632912/nokipetadogigetutu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a7cp72ssgas79al4vkikonv75/jarabibizuzederenisexosu.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8965777f5---remuwukajasax.pdf
    • http://bmsorganica.com/userfiles/file/dimalolida.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=csc+tec+exam+questions+and+answers+2020+pdf
    • 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_off0000dfc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 16792 bytes
font_01_sfnt_off0000f7da.bin
3e6c0cdcc9b88c413910bcd41b3d7216a8ddb4fa6ab64c40872cafb7d758623b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 11444 bytes
font_02_sfnt_off000112cc.bin
0bbf0ada1e20a677b162b05285fd1d9df137731578d62e0fbeffc8dcfc6837d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 17216 bytes