Malicious PDF — malware analysis report

Static analysis result for SHA-256 735eab3c1dab5fc6…

MALICIOUS

PDF

96.2 KB Created: 2021-08-16 03:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0dfdf4caf7fd7367edc9dc473d65aebd SHA-1: 1a58deeffcd9585acde346fcd89cd138b1195b3b SHA-256: 735eab3c1dab5fc63564275e05de83a9f129b293a72dbaa03003cb289a068d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs hosted on disposable domains, suggesting an attempt to obscure the ultimate destination and evade detection. The presence of these links indicates the document's primary purpose is to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/miripirigux.pdf In PDF document text
    • http://logistra.fr/ressource/site-image/files/xadexopiwofufujipo.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef518175db---zesasepusenixa.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9880e149fb7568091c8ba866add4f81e/xaduju.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/47648773442.pdfIn PDF document text
    • http://df-2.de/images/daten/file/81009858916.pdfIn PDF document text
    • http://vladekoservis.ru/files/kowiveboragodeguzakewa.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/povufot.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/tugodufukazaxumegamerugaf.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074193e27d14---65179134519.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/pojakodixotagotijoweja.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a379e8afca9---vofiladazekapofufugibofep.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/79455680103.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/suvovusoz.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b5901b0fa---bazezosiripuwajufepupap.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9e4f68e3fccdd0907553c6487a5da7dc/30528538849.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/zigipokurorigiko.pdfIn PDF document text
    • http://186086.com/upload/files/79839332310.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/59533752049.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/92109830680.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/369f14866a59347b86b31a5a9e1fcb77/15143853162.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fba21c3689b702bbbea75dc90c7398de/kedugegadakoxokisivej.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/ba758cfcee4759054bc7c4deaa1c2d03/41980876420.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jegud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=palabras+esdrujulas+sin+tilde+que+no+terminen+en+mentePDF 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_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 20032 bytes
SHA-256: ccf5d73c086432deb6c255443f4bc65037c08fcdea89e76064534fef85484036
font_01_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 10928 bytes
SHA-256: af563a2f0884cbd40c8fcedb746d9f0a55e9dae18b6b39c146b6c73f46629c8d
font_02_sfnt_off000158b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1