Malicious PDF — malware analysis report

Static analysis result for SHA-256 864c8ee6c300dddc…

MALICIOUS

PDF

88.3 KB Created: 2021-08-25 21:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6aa5eb020d2933b6c676cbd5d3accb75 SHA-1: efd53c32433df7dabe0accf4cdaee0f9685ba502 SHA-256: 864c8ee6c300dddccc9cc4fe01ba019680e2d1e3310f144e75b99ed333cee467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://drafthe.ru/uplcv?utm_term=reuben+sandwich+with+canned+corned+beef PDF link annotation
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/g9jm883jb2bicksdftv521kp20/95586830636.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6531bd558---22657679527.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b4416d0cee81f1f93a2ec9c0a6f38030/dunerodojaguxi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ngvoqsppg6uic3trhm9i0arsgs/mataw.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/wadixud.pdfIn PDF document text
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/kefililobanigepar.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/ragajonopawumofuwalidabe.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/1d270b84f8e2a535dc1eec1861726005/67236581407.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ae673c0cecfff67584ac18c4a2b50957/5916347327.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/36846513716.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/90207355588.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/jixafivazifolinukuluxixi.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/xazutovaratazobebo.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/46335204009.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/xufepigabaxaxovaso.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/7259694198.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a712f8c859---66187024296.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/81141335184.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/j47120e0c1uc94k5ikdte46l93/87948985222.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/binukef.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/89551709055.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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 17652 bytes
SHA-256: 868edf53f0cdf1ff214ccea334bb5678f3dde04d8407ffbfa37e6e5a3900c62b
font_01_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001396e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 10900 bytes
SHA-256: daad3dd5fcfe50eab18ab9cc35aef989f660d647dafe4f87b1c8beeec3f8ac57

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