Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a41afb919cdc0b…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 06:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78079ced008612b82805fb173bf31d02 SHA-1: 134842c363a228a697fd57c16bfa7d6742cac0e4 SHA-256: 77a41afb919cdc0b9da9df9bc9724f072d38f5862d32bcd30c0b522544d1cf26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://qualitymattressfactory.com/admin/userfiles/file/27942318595.pdf
    • http://naphogacomposite.com/upload/files/90400208902.pdf
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/visawomotuk.pdf
    • https://anmimar.com/royal/userfiles/file/53450202273.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161176c0d438b6---20872204966.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/e1orur6kbg5f9f2tiklpr9to35/losawefowelejavorujevosi.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/81558744907.pdf
    • http://mistral-paints.cz/userfiles/files/3089837010.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a3af1623---13146330030.pdf
    • http://tubemakingmachine.com/uploadfile/files/sogopofixezima.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/55235734209.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4e11e0d5c0ba47588e4fa328e7a6853c/wetowovujoxebububup.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3babb1aa255a9ab16baa29bf8fca2a08/68074492628.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/dc866756f68028c6d5b89045623f7afb/raxokimafipafodifixuno.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502d726bb8---mulum.pdf
    • http://chaitraglaze.com/uploads/53415586490.pdf
    • https://olterus.info/contents/files/tetomejuzomututetoxa.pdf
    • http://amuseonline.com/absite/userfiles/file/83582244763.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a77359e729c---wodexuruluvetidanuzedav.pdf
    • http://landroverbh.com/ckfinder/userfiles/files/39255878751.pdf
    • http://bygreenpure.com/userfiles/file/boxuvudi.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4760676e8---lirimerefowonawi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611ab22c07cc3---65479795019.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pradhan+mantri+kisan+yojana+form+pdf+download
    • 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_off0000f30d.bin
0af4971d2a3045110f441ef2af9f3b680ad2f00557a821499546b9de61f8aff6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 11056 bytes
font_01_sfnt_off00010c95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
font_02_sfnt_off000124a7.bin
d2209a6d50a360a2225ca012e5f3305a4e3bb027c30a20c44e48c033b0b07e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 18756 bytes