Malicious PDF — malware analysis report

Static analysis result for SHA-256 895411425099f04a…

MALICIOUS

PDF

91.7 KB Created: 2021-06-29 03:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2bd2999de0a09a4aa9f5d3b88408c55a SHA-1: 8ba83d534013518b8a0fc06ddaea23386dbe7959 SHA-256: 895411425099f04ada179971f33515670d539df6fa4bcf8bbcefb62810332ecd
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the extensive use of external URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=lady+catherine+de+bourgh+is+darcy%27s PDF link annotation
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2656c440e6bf797ddd879e6f32c3a944/89169155441.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6gqgt8e50qocbv42vn90lm9f02/danavudivawekaxewamoxomu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b750a86192d---risamomezezo.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f63dc3d10---48227167579.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210616113213.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720f3211a11---nopolikomifofizatet.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e5710ff8c4d0c5ee76c007bbd6c1523a/70627654915.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jiu54vnbhrk75v3limjtj8jmj5/94565750694.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/97876280855.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/d2d0ed7161be65515465b351723ee857/kanaladefaroz.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jfi8vu8omsfl7pq6vaujivq4ev/98004974408.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f07c9736a---41425902465.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/2708212254e9a66bd793e1185be83321/gujagin.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce27696b2a---74089145672.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/dafeguvimewifinetesasiko.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/a111bc9ee375280fc6b273bf3c47c7cb/84598163041.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8278778018.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8c1811fe5854ce0446de5892d9e3befd/rivejemapugug.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/rtf2hqlhh31ulb7duks0tmk8sf/fosewoluwalavitituwi.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/70154725715.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afd928f7d---roterimosemeruribo.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6dc4cee61---vanuvemotalabos.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b409a0f637c4b6c309b6cfd83d3198e0/pakaginolewika.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/478635f678b1aaccc5b4b82a433bda7c/tefofusabuzozimodi.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/rupolidovovijetoso.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_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10948 bytes
SHA-256: bfc097eb68f3f320b6451dc38e6a3f037fc14c7715b1c97857d91e0cd7b021e5
font_01_sfnt_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 18968 bytes
SHA-256: 312f4c43caa5b0b5c073160902a2e96c927f4049dc7427b8013d1ad3de39cdbb
font_02_sfnt_off0001479a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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