Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c439f644ea872a7…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f66ce86456e495a3bc55a38167b90793 SHA-1: 53496da8e2be210f3a4d257bbb4802a813b1b729 SHA-256: 1c439f644ea872a743e6e275541915e956bcff8e2f0e0fc6af4d36e30fb5eff7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=electronics+crash+course+pdf PDF link annotation
    • http://szentimresiklos.hu/upload/file/sidafowif.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fda5095259f---73127381931.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/75tplskdacbf7tml8envq427pj/43103341031.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/nepoloxivonu.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607796d165c02---82941203434.pdfIn PDF document text
    • https://primer-spb.ru/files/files/resov.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/41194739140.pdfIn PDF document text
    • https://europartner2.pl/uploads/zibisek.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/lcva7cpddo47omprhpbfnsjc84/zidulopidiwetezurikusete.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3bddcfa7a2b8718cae4adfd8673bd057/bubomejetikonoze.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/20gpb4o5kbhr5gcb69vbvkdb7u/22189703963.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/sizimubolivuwovapade.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a2e625406aaccb8a900fcf999bf0f3b9/sapuwemixidanekexeluvede.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/86043263879.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/84016408199.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/99752244396.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/magin.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/rolerexedosadinemalo.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/puzapedifitiwuko.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cc57cc3e4ff---netuweg.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160847493b36e4---xojipojikipewom.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/19334495e551d50e0bc5488658763e62/mejalupowapuroniwewejas.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f1b6367a3---63631797797.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e181988ce---xajerowixamaweteti.pdfIn PDF document text
    • 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_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10800 bytes
SHA-256: 5dc4c78e9d01edc5ce3399d59b4cf80bb3eb9e9435f5ad13f538b1c6126508e1
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 17816 bytes
SHA-256: a30bab8716e27a074dacd5e04c2667ec163c7c054e74c7b4be59c9f508dcff0c

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