Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b040c01c348c816…

MALICIOUS

PDF

82.4 KB Created: 2021-08-26 10:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1b36441541e01acaab776ed7ea83e25 SHA-1: 6f95014bed17371233a64de621137f753cc14625 SHA-256: 9b040c01c348c81652d9a1f319801a24410ccf0178a0c505112d3614fd4e9814
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/454ad771808f01bba5774d4dda7e328f/temor.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/219b2ca282821e6b1e8c05f38fcb1606/vuburuvijarofemomugujafaf.pdf
    • https://cplastik.cz/data/cms/file/jeravepi.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5020l42mf2v8ps9tasm6uiauib/11033616446.pdf
    • https://cgeminfos.ma/upload/file/48595085361.pdf
    • https://sintasyapi.com/img/userfiles/file/7110892689.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e087398b---66248590171.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/30948aa2fb06c57e1482882bc5af8ddb/49117127981.pdf
    • http://fese.in/ienupdimages/images/files/59217354279.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b0lb8kb532g520gb6a7a0l9nqa/19837361206.pdf
    • https://galerie-louise.be/userfiles/files/bezemetavoz.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094b334b6a03---66461205132.pdf
    • http://ruoumoc.com/upload/files/xuliwomitowivinegefonetof.pdf
    • http://libertyquad72.fr/userfiles/file/dagalikararela.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a0gf0vikkqmq4rciegpbleobq3/regedi.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a964fc6807b---29078668297.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/40276695435.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5911f94fb94aae76a6c25f49fec7c8de/70112215035.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db3558fef---pukaludafodozebevukifo.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8adb3b129ea2297aeddf916a2c6e8744/28106304371.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/3oe9fm4u62q2dimajl93uqdavd/36018405451.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hardware+and+software+difference+between
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/51353050339.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_off0000e039.bin
b3354cfca41e04993860947edf14de397f79f252de809601741d9a313986dcf4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE039 16120 bytes
font_01_sfnt_off000109fe.bin
2fecf0d888178a13a7bae5220cd9ebbbd7a9d3c15b6888c97bc1fe64a9587023
pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10640 bytes
font_02_sfnt_off00012280.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12280 16792 bytes