Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06be7183938cf1f…

MALICIOUS

PDF

92.5 KB Created: 2021-08-11 23:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bfbf431e3f06d85bcf977e34393d095 SHA-1: c5881f6e9cb3137f24fa9632a71c6fcdd460475e SHA-256: a06be7183938cf1f0f3c2cd837f8f8ee883edcee28c2601e9a7c0bd343b288f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to deliver a second-stage payload. The URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=chick+fil+a+employment+handbook PDF link annotation
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f561ec---jebew.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/33501382415.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fatuvodo.pdfIn PDF document text
    • http://artospace.com/pics/file/31704441735.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3e6a5df16f30cfdc070a2c4e941f16cb/zurimi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/4e46086f07e80241dec88227ec2af471/vexotozenemirifunukol.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1uds94fkbo0u9ir2vnif7d7kn6/vogimafesazanefilitewot.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/13887119790.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/30156119905.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/37073977209.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1a52d426---49935887899.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/69683494583.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/94454045989.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021071405095573499.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/18460049412.pdfIn PDF document text
    • http://strandedtattoo.net/file/15064468255.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/56716543508.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2b021b48---murabugasasam.pdfIn PDF document text
    • http://slsnn.ru/content/files/rorovojanivuwuwupuja.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/nelisipobosemagijojogese.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/60508682622.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/12562002182.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 10992 bytes
SHA-256: ff14655bd4d05844d9337c79b036c929a04d4ae5d07b52ab339f48827aa61424
font_01_sfnt_off000110ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CA 2768 bytes
SHA-256: 4c98d54de270b36ec6e4d67894fd109da8b0a68ebceac7b149dcfb64af2dc67c
font_02_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 17696 bytes
SHA-256: 5f102f679300b043db3253aa1cf77a2b798f5689e325e3da4f21a5fd3a0ddd8d
font_03_sfnt_off00014ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1