Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c7b4fcb1843394…

MALICIOUS

PDF

89.5 KB Created: 2021-08-15 05:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c954f0be3643540c4fd7643fb0867665 SHA-1: db27544e83ce7012882c71047cc914f70df4b68e SHA-256: a2c7b4fcb18433940176340cc048616ada044a4efb5adbaa9b6f9a5f77e49c57
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. ClamAV and ML classifiers identified this file as malicious, specifically flagging it as a phishing trojan. The primary function appears to be directing users to potentially malicious or compromised external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/33637c969493a14f7204407cb145df0a/tedatovekefakimadimoveti.pdf
    • http://alpha-cp.com/userfiles/file/wabat.pdf
    • http://yao-cheng.com/uploadfiles/20210701224417.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p6d08gf01hsdufmbo75241vqnr/tenopajoso.pdf
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/10720011273.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082266029912---muwexigesoxoliriso.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69319456294.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6dd97f36e6---69621660315.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eh3v53ea0ct5r6dehniv1kbmu7/81700387674.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/414338c70cb7adf7d6b8d7dbaf19ced6/73819029500.pdf
    • https://multimetrics.com/ckfinder/userfiles/files/pudotopodep.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b873803a4cc98a77952f5ec4803f28dd/83705064604.pdf
    • http://waberry1969.com/clients/877040/File/rotekekudonap.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/62622689169.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8dab0015---noginikekaveku.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/a891c550b08d197082621925e22ed3ff/xejuxomewaxetofibi.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/50bd0fdf888fe89bb31d8a13cffca169/wipegomek.pdf
    • https://alatheir.com/atheirwsfiles/file/6062084229.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c7171474---gigojajeki.pdf
    • https://autotronics.vn/userfiles/file/46012106025.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/215d4ea7af78a5cef82602edfda84c76/77685522700.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1dd3ad1e---3929598072.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdf
    • https://aldurra.ly/images-editeur/img/file/tobilasonezogukoxenokesi.pdf
    • http://chemicalengineers.ie/images/fevidesotodagukotani.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc322824b4---suwaxakalakasefukit.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=primera+condicion+de+equilibrio+ejemplos+de+la+vida+cotidiana
    • 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_off0000f4f9.bin
fe94cd071bca03a2cd14176fd208683642ffcc58773fe21fa4136b1a52412faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18344 bytes
font_01_sfnt_off00012310.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
font_02_sfnt_off00013b27.bin
2a90ec94518eff374f35b13096d13fd2e75c08df0d355a914c9f8fbd128f62cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B27 11256 bytes

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