Malicious PDF — malware analysis report

Static analysis result for SHA-256 02fcb626295b916c…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 23:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4493650731c58fa2e0d3adc6f5cb3a09 SHA-1: 951dac7726418185e0d6660af2026b55a2abd7e8 SHA-256: 02fcb626295b916c71d7b1f7ab2dd87d9bdc6cc4826510c880b30ee5c41ec7f2
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, suggesting a link farm for SEO manipulation or malware distribution. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and numerous external links suggest the document's primary purpose is to redirect users to potentially harmful content on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b053476a107---87506737264.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92a3f21b96---67043458402.pdfIn PDF document text
    • http://terminsk.by/pics/files/silojasukujimarokusudonij.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/63717156646.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/496c9c23cdd9ea7a2164262989567de7/33964530008.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/8792164366.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3fc30cae---61080826292.pdfIn PDF document text
    • https://agatanorek.com/files/file/6557494331.pdfIn PDF document text
    • https://luminex.pl/upload/file/26406205336.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbe74db18---kutigizafapol.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nafin.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925a51689be---saparatofuwizaketererog.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xipitonuretetofulasese.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/00e874adfe19a715327a29ccf92ab1c9/8409287529.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af66455cc25d8f5affa94813be4b4b9b/noxemiwabodif.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1ac5a4dcdf6bc77cb0609630993f8d6c/28898965657.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2708ec9f68---wunegoparaxomimubus.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/3pdv7p6pf3ei8tc721dn5d3eil/13569052867.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160767c87a91cd---radigekofuxirujaweriwuvip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4558116d05---49096012393.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/db43abd13be834a3fbc61ebf0a826503/bojumumi.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/dcd8638e976b5ed05bc080953c43c59a/jakigowamexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wax+on+private+areaPDF 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_off0000e8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10192 bytes
SHA-256: ffc1f1b2e2d5d59e984ad56a0918b2bfa3cd83589137868e777228f223bd27bc
font_02_sfnt_off000117e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E3 16984 bytes
SHA-256: bd8fa83b1d6ba76e35e444759725495bad94ebe6bd8a49c8cbb78117d31ecf72