Malicious PDF — malware analysis report

Static analysis result for SHA-256 340a7e94f9f87f8b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 19:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1d0646daf0654d80ca69c3037c3ae60 SHA-1: e8784bc871cd42d44c6bea13bc662d1510449aca SHA-256: 340a7e94f9f87f8b2a770e39cd7560989a9e28e82c8a2f4aadbaad10e5bca0af
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or redirection mechanism. While no executable scripts were found, the nature of the links and the detection names indicate a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://luatsuavina.com/userfiles/file/nisifilobev.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/8943d7340e6cb95e759e3e3260dda524/76120222554.pdfIn PDF document text
    • https://e-midas.ro/files/file/visiroravenaraxewamo.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/mulusirolisese.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbcc7b79c---gupojajibupowosanawi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/fde8b6dcc5d76d7521f9bc4a63acd68f/lagemumonuvif.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/90386542025.pdfIn PDF document text
    • https://deepex.hu/hirek/files/dafadawazikomokimuwawaxek.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/20421954348.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a5e126e189---zegutosumi.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/kabinobevatixapilano.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/dajomorapamorapupeke.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/99587660602.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lemarisisan.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec523f45002---temizinovomeronavine.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/73742909228.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160807ba9963ba---37250109955.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/fopasep.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cc5883c6---revaxibazegupuvolefubu.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/69386763119.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/v596i456f205e408lt55d0fvsl/muzixu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sidukiru.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/45a36c832f32802b1f652e7b21804b1e/ragodomobixajasitotivup.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6281c814ecb7183eab46a4f6f24c23ea/gebilatituvujobuvir.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec3ca5fa8b---87254068795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=isuzu+4hk1+workshop+manual+pdfPDF 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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 10860 bytes
SHA-256: 5ddb071853028278e7160827f5a8892e4f7378bc1948c604d2623a0944550375
font_02_sfnt_off00011f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F46 17612 bytes
SHA-256: 41ff02c7361b029b2e38df2c995fbfa15d22e223267e268434eae06349eb9a2f