Malicious PDF — malware analysis report

Static analysis result for SHA-256 1363c1473dd9a1a5…

MALICIOUS

PDF

89.1 KB Created: 2021-07-23 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e4c838cdbef7ac3cb62686fd6b760fb SHA-1: aa7e4b840c0245e94015bda4e071f6fccdeb7a76 SHA-256: 1363c1473dd9a1a5ac3854f2df22a53901d507b3473e69b7a25c04fc3dddb43a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to external sites, many of which are hosted on domains flagged as potentially compromised or disposable. The PDF structure and the presence of multiple external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pho32shabu.com/uploads/files/56929957433.pdf In PDF document text
    • https://ap-qatar.com/userfiles/files/jixukololenisixexadexex.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/68771073878.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/19273750592.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/gisululazizukuxo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607177d945189---50723407671.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210614132542.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1624825372.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/sr5pfe911he91bjdf4v3mm3pj1/jebusutiw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07113a612---fatijulabasefojunab.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/desijolufosamegon.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fefuzopugebes.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8adb3e08a---kobodakatutekivunusowif.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/dupikapusog.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/benifapuwilunonazokefadef.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061915222537.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/a670eed56055ed002b023433197b267f/52177472654.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/08c97fb6f74d95c018e28116a029bb6b/74513937312.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160839da439df0---kezuwejifoxiridun.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/19250843576.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/rojepezitixetorajepag.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd35c530f9---badilirifewow.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084501404b50---63121025862.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/30817140025.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24186a9926---nuvutajeviponobaxijetit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+the+square+footage+of+an+irregular+shapePDF 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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 11100 bytes
SHA-256: 41b521145375315f5c3f591dda292e6b89f75283cb74141411303bd88e7fc765
font_01_sfnt_off0001126b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126B 16720 bytes
SHA-256: f24c3a8278f7fde10ef2cd9bb90d7e2c928a42dbdd456055c8e78c3f8d403023
font_02_sfnt_off00013e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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