Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa29de789197341…

MALICIOUS

PDF

79.0 KB Created: 2021-09-23 06:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbf3394d687b952829d4f939b0254474 SHA-1: ef11b51455c7989e3fbc6dd151d63628b68cd8cd SHA-256: bfa29de7891973412bd5523803292f3b7aa10275d95f11b0527b514987ec36d5
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, with several URLs hosted on what appear to be compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fa93112c---xulusiwumazaw.pdf In PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/24951923134.pdfIn PDF document text
    • https://labelmarket.eu/data/file/68783856366.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/7343904368.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/47343215512.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/d134hit5uneucrrak7f0h19mpo/guruwonenab.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109011347163906.pdfIn PDF document text
    • http://popmetre.com/news/files/25634525112.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/auisav27mffn3p1e9d5dsg78gf/furipesazonusimunupira.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/550180202.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/tomumutubotaweki.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/30523196720.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/navedewetev.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/95764926929.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/wafubi.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/kikeluzajisafuxiraz.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/04f5acc8e403858c4f4900af60e5356c/25704707324.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/59785647936.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/fovanujilodizenalej.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/vinobefedugobewi.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/20578731589.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/81822263805.pdfIn PDF document text
    • https://primer-spb.ru/files/files/32082684348.pdfIn PDF document text
    • http://nktrading.qa/file/files/wovavubevori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=order+of+solar+planetsPDF 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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 17132 bytes
SHA-256: a22e2dd91264cf828d17a98c0532ea12d0f808a17945495cdd68d7406bf1aa26
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10424 bytes
SHA-256: 2699f9bbf896ee564c8951e0305ed66c4054b0129816b3d646ade67f78f3d27d
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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