Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51833313647dd7f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 11:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af47c929a89ef810d435213d87ee888d SHA-1: ce98bef2af6ebd42849445bcb3aa83ee3b927de6 SHA-256: b51833313647dd7f3e24131d2e41218f833b5e0c0e1a2f177febf3989da12f4c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adc54213558---wanisakojosezeludixi.pdf In PDF document text
    • http://e-hane.com/files/12776863152.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/psfqmmk87gun10c218ahuquvip/53457576542.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/13536100006.pdfIn PDF document text
    • https://prevodi-plovdiv.com/userfiles/file/vasizejefike.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/tufad.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/14038124327.pdfIn PDF document text
    • http://bdcomunicazione.it/file/jojuwas.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/70926745016.pdfIn PDF document text
    • https://datawire.gr/files/files/takonoxulejakokum.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/46520798565.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b97daac7---gubuv.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f6ebc7c43b---xibarejigesonazavarutagod.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b77de66269a---58600896955.pdfIn PDF document text
    • http://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/bipenor.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75899021847.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608862ac4699f---kanuxovanepomogixan.pdfPDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e57e371b9---32120779683.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/gotixorulobalasipame.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/30689100379.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/wadebexinimisijatebuxefo.pdfIn PDF document text
    • https://people11people.com/uploads/File/wubogadidinur.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/xatefojaxokobenirifi.pdfIn PDF document text
    • https://mmszke.hu/files/file/jemeje.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9585771df---32054208047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=friedman+jj+jr+manualPDF 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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 17288 bytes
SHA-256: 2ad0b6fbb1ac64fd1998a963254f3046b7f4980196c92621e93bf22512d906c9
font_02_sfnt_off00012e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E60 10228 bytes
SHA-256: 1bce26343870e7150db70ce76931acc8783d5323f21fd0036b54d52d1c6fd68e