Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ee09abbedd98f…

MALICIOUS

PDF

89.7 KB Created: 2021-08-25 09:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 866d19e7c6f6d36a77f9bf42e15ac1ad SHA-1: c67fd89cabb7f2a6e5ede83b50d817ea7ccee8e0 SHA-256: bc4ee09abbedd98f1d726e35539a8873b6a0d088d77ed2429f9e187cfec1d5e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary function appears to be redirecting users to external, potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://smidgel.ru/uplcv?utm_term=who+will+cry+when+you+die+in+english+pdf PDF link annotation
    • http://gsxr.hu/userfiles/file/71182924115.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/65e8ad978bf1ad2d0ba0e88ad1e0dfcd/78253892487.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5591b90010dc2838c9b490388de37/jesujigarumuk.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/71224282387.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9nqo3j1u9tlvtl6t96oe8vjvvl/54289740410.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8e6b1385e---muxezeji.pdfIn PDF document text
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/tepup.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/kowedozubodaxatul.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160857d073090a---meriwolusileribajabatagaf.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d632af0cdc6---gekagiwulolawilug.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/paxelifezav.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e41c885f864f1c93db806217fe469d4f/74415312301.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/rutodemekelosowamota.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/93160621963.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/86584674313.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161257d33034e2---92963805070.pdfIn PDF document text
    • http://globalaircrafttech.com/ckupload/files/tuxamodugaxixuwusinix.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/11876298944.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a84c45832d2---vutoxelofirepe.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/tuzixixegabedi.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/69341162584.pdfIn PDF document text
    • http://www.puhito.hu/uploads/negadoxope.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/31398673621.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C3 1964 bytes
SHA-256: a0c737f98dd99db0c479c4049133cbd446886b55db36b9e16cc57e408113bc63
font_01_sfnt_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10932 bytes
SHA-256: f10a1d8a2f88ae976ea17f0d0c8e5998a80213648f25cf1a98ff694104595a4d
font_03_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 17648 bytes
SHA-256: dfda14b6b099d7455754dffdc82a18a14ae70cf18bf4ebc268d0c7074752e3f1
font_04_sfnt_off0001296b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296B 17288 bytes
SHA-256: 08d45ce622014201c8ad379fa64384506879cfd4be4aa981f876cb2d23afb6a3

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