Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fb84a83331871f…

MALICIOUS

PDF

89.8 KB Created: 2021-10-08 18:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d431458fe64cb6004ba58870e1bf167a SHA-1: 39ed06e63087746460337cdd9c026c95a4b86ec5 SHA-256: 27fb84a83331871f96da27c3735328360083c2bb2b3e3f95e520246a94b7b31a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that lead to various websites, including those hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a malicious document as a lure to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=you+are+my+rainbow+quotes PDF link annotation
    • http://3wsystems.com/shipinc/userfiles/files/wuwebidaxasolemukegulil.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/panubibimobisatira.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/tanakolanuzibi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e78e5b63f---55768805388.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1615049659b251---limugurakuzetonizove.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/wevasepe.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/36076004480.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/78246201280.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/zefitef.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/joxagopasimafovuzitula.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/39014779164.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/74385392960.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906073002.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/58ms7bf5k85iph7sjjl7s8dkq5/61032897978.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccn619livcpme7fakfd6v8id2h/43154310836.pdfIn PDF document text
    • https://premiersuli.hu/files/files/55652760760.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/simazunumulonisud.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/garozepijajekodasagur.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/22713354926.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/rigebunelogofakomasumes.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/71019201952.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozafefilulojekaputexaroj.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/70184367452.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_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 20392 bytes
SHA-256: 27f20aca45be6bb77a03c1f0592a5bba759b4bd5a512a60297aa66ed83cf17a3
font_02_sfnt_off000140f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 10792 bytes
SHA-256: 17213939e4b9c91be405c9cf057b113a09e6ff5c6eeeb6527c34b32ca22f0530