Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2e885d8e3b2700…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 01:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a423a002b13a3c1dff2022bb970ca4b SHA-1: 1aaf6dc79678a75356733677f8cccd62b1ad80a6 SHA-256: 4f2e885d8e3b27002099a90785c7722d713c8587eebb9e38257f1886298274bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on disposable domains or compromised CMS uploads. This structure is indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://tjpapigroup3.com/contents//files/regagivedafirurejigep.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52db8a6e6---14316569706.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/21040433965.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a694233c5c---21396597289.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/91780314210.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/94ad927b164a52d6b56e6c7467fb8711/luxafaxefulivomoselaxeju.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/gepuv.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6bede04b49161e19a9b962a9f5c1b682/mujasiguz.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1aabe858d---96231707207.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/93890847556.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/dabelomejun.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077325cce40c---8958437348.pdfIn PDF document text
    • http://schokozentrale.de/idata/xopozomonubomogogunolupek.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bofatajetitapofixekad.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/xujafuti.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/52528259075.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/8761351155.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/56054911179.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/mujikabiparogapekopu.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/piruzoxozifimusetagez.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/449763624.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/69010340736.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5d11a9b6---31062181226.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/30239949138.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/81392592903.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608148a499cf3---pelumemukedefabemitinuvo.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/91733338506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=block+outgoing+number+iphonePDF link annotation
    • 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_off0000c319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC319 15876 bytes
SHA-256: e98ff533130491b2e859b948122f69be0a0a329fddc82164f561eb0c7787214f
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 10876 bytes
SHA-256: 9275c43a225ddc52fa946dd4fd4618d976ad6ccde961d370406c8a089cfa592d