Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a425a062073b37…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 14:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 971c4c0aa2e03a2da7c99310dc25f4bd SHA-1: d5a07f3dac38978bac47ee9a779fcedbd1cc3f1a SHA-256: 26a425a062073b37d8185a0d1eb95333c8031a4f0f4c6fd9455d135d0347df15
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs that point to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URIs and link farm patterns strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=islamic+names+book+pdf+dawateislami PDF link annotation
    • http://silver1979.com/upload/file/nopalalasedemixolepiji.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/20278762463.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210816/file/16291466959392.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/81762783806.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/78298401391.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/16354840742.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f38fe0ffd75d3e3c8672c7a98f8f9945/papupenukulusijalesase.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada868b3245---vepixolamuzosilugezezu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/zamarugasekumoleve.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/671fb4e7f1b0a2ec55372e32bff7bb2f/37808608396.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lonuzebigenanugo.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/34940547958.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/18424201636.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/dojidam.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fffsmb76ifepuf0vgs3snv3r25/84075499317.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b561b0604---lewumopipeki.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd1c2cbe6---41328777322.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/k1b1ji2geqnmo35e8mobjvpgsd/73558904459.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/duxubibuxebupan.pdfIn PDF document text
    • http://come2menorca.com/images/file/91506899433.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/gaxal.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94239344d8---torezabupinub.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 10948 bytes
SHA-256: 39c55268167c69a19d4c8b2d6ab38b327fc769e4a08a0a7a83850e615dbf70ce
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 17768 bytes
SHA-256: 0b81c1e9499c44f349e44f011e6dc66708ede6e3a8874cb0cd1f3955d49409c7

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