Malicious PDF — malware analysis report

Static analysis result for SHA-256 a225a21ba82ba150…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 16:03:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32cec2d12e85c77ec49ef97cf9684f90 SHA-1: b8ef6f7cf84d0aeb95120811150b981df2fb0e39 SHA-256: a225a21ba82ba150139af6a579156d62677a9073e300b7787f3b8b2b5ccad12a
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=disaster+recovery+definition+pdf
    • http://www.florentmaussion.net/userfiles/File/rodifebego.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fdac0c5be1a---kovujeronazasom.pdf
    • https://sogelec-eng.com/files/ckfinder/files/34417852898.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4ae3d7939---kijonizifanesenopemodax.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/wevazuxefefaxezavozuko.pdf
    • https://bioesteticaonline.it/file/64857006186.pdf
    • http://kasaitogo.com/uploads/files/83526055217.pdf
    • http://clarksville.net/wysiwygfiles/file/bipelapapemig.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a5eb7c62---loralapanuvu.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/72e288baa64ec2e0aa3bf66a64776f66/1954201462.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133484082f2e---67993132753.pdf
    • http://gianniarnaudo.com/userfiles/files/mafarilel.pdf
    • http://driscollandgibson.com/images/edit_images/file/3728643355.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb4447b55b---pigajetuzunezarokulujuvu.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/14822432193.pdf
    • https://webmenuplus.com/images/file/42442069195.pdf
    • https://ctsgroups.asia/images/file/86134702875.pdf
    • https://hosvagyok.hu/userfiles/file/junitomisibigalefufona.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/19308022049.pdf
    • https://luminex.pl/upload/file/29447062182.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1e6b751871a87062cb6dce712efbcfa8/64091872975.pdf
    • http://www.moyekolodin.com/files/bewikuwiruxevaz.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_off0000b207.bin
18034bf3cc7987d666893a298b0bcc3ae294772ddc1aa2ccf709093a94c387d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 15020 bytes
font_01_sfnt_off0000d758.bin
f9084817b45f060d3b9c2d28f6216c66555f726b1e44a7b98d5b835bd5c0357e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 10748 bytes
font_02_sfnt_off0000f03d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 16792 bytes