Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd6bfd11dbe024a…

MALICIOUS

PDF

70.2 KB Created: 2021-09-24 19:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7337ebb4d7870b238202a5585fb163 SHA-1: 0ac396dc0aa43d5cf04647da78ea5d8326328f91 SHA-256: acd6bfd11dbe024a8421a903ac037accde4784e8a55cae9986c62d6977e82e42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads. The presence of numerous PDF links on disposable hosting suggests an attempt to distribute further malicious content, likely through a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://tiendanatacion.com/noticias/files/soguneloxuja.pdf
    • http://retailcop.ca/files/vubatenofobamamukipiv.pdf
    • https://essaidafm.com/uploads/FCK_files/file/50357676378.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c0f68eee---16634220622.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/papejedakoxolekutisifo.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/57943019796.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/2mhbtre53d0aehpa8rot38ptf8/56974879631.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/95223697478.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3886c785460a0bc1434eece53b244786/22808449604.pdf
    • http://yavuzselimvakfi.org/resimler/site/files/79324666164.pdf
    • http://thepokeluau.com/uploads/files/rarigimudilalix.pdf
    • http://polesprogettazioni.com/userfiles/files/33059857497.pdf
    • http://pinxedien.net/upload/files/72672280716.pdf
    • http://ct-tci.com/cttax/userfiles/files/falatofuxatusex.pdf
    • http://houstontca.org/Content/uploads/files/98004404735.pdf
    • https://bdblue.com/ckfinder/userfiles/files/57822419569.pdf
    • https://oazapiekna.com/zdjecia/fck/file/virowekixutuz.pdf
    • http://raylutickenterprises.com/userfiles/files/barivarikakavip.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/saradopura.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/68651db7f5fc5ba0e7157e2c5c1c7bd4/43894768468.pdf
    • http://secretinvitation.net/images/files/79378287383.pdf
    • http://asijskepotraviny.cz/files/file/96154611044.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=samsung+galaxy+ace+s5830i+firmware+download
    • 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_off0000ae62.bin
5c91ef0dc30b2c7786446fb78e1a8fbd6367644c47994b094d2ca6e347a8f8e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE62 15856 bytes
font_01_sfnt_off0000d729.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 16792 bytes
font_02_sfnt_off0000ef40.bin
1ee241e53f42c2bcf49c2ebd2d7b7f582d3f1398c0bb408f70a05c386bed0f2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 11836 bytes