Malicious PDF — malware analysis report

Static analysis result for SHA-256 26460315e413960b…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 10:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 793d8d92593920bc65045484c41ca640 SHA-1: 2a09a4121ea5f5d662d6dd826f0690f6b0395cd4 SHA-256: 26460315e413960b85099f5406bab4bbb46b5e348ed1ba3ee51fbaa74e088aff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were extracted, the presence of numerous external links suggests the document's primary purpose is to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lphgu6k4ja8hpcuv7qkqsccnn3/zimerivuwibudumekaw.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac41385fae---dujisiwadefigit.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2c0cb909926f875644499690482a333a/nolojozojatarukatotevunug.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b66cf1235---2397243129.pdf
    • https://twr1115.net/files/fckeditor/file/95551089269.pdf
    • https://33mobility.net/uploads/files/senopanog.pdf
    • https://balaji-technology.com/userfiles/file/luxuxelip.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1bcf3smj50ich03u90pkvq85cg/21909055683.pdf
    • http://fra2ange.it/userfiles/files/33759389296.pdf
    • http://asbu.net/uploads/FCK_files/file/69508589109.pdf
    • http://kipia-nn.ru/userfiles/file/64407178572.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16098595ddff8b---41189474113.pdf
    • http://pronobile.de/catalog/file/69273486653.pdf
    • http://shhs69reunions.com/clients/e/e9/e92da0bc0099326815942f81a5c18dfc/File/kosuvekenawumoraliduk.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/96d53cc814827d96435ae334dc8ca726/98937635106.pdf
    • http://1utilaje.ro/mm/file/wukofexaz.pdf
    • https://apc-algercentre.dz/ckfinder/userfiles/files/23080806013.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c05c5bacb2d357cac99cc8da7a305c71/13884879919.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ld5sf2bd8634cjaf2nthbn5drk/nojodozikagovariboxo.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60013464cc---28067148515.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/48583099764.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+masque+of+the+red+death+summary+and+analysis
    • 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_off0000eba0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16792 bytes
font_01_sfnt_off000103b2.bin
e87976b7edae39a4b9eff53f62dc29c20dcba3883b47dc0b31cdd11083732432
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 17088 bytes
font_02_sfnt_off00013030.bin
3d3e3a6ab1ddc1fe2d23eaaa01a0d9a32779d16e5a62dca0b625cdc8677aec72
pdf-font-stream PDF embedded font (sfnt) at offset 0x13030 10940 bytes