Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ccbdafe851c4d9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 02:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 729d4c94ed2303cc160bfbf768559d76 SHA-1: a83d562fda7b6bd0d4e29bcc74584abb6bd49a80 SHA-256: a5ccbdafe851c4d90f09514641a592594c1cd8f1cc2d79fe6195a199e483c0a2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The PDF structure and embedded URLs suggest it's intended to exploit user trust, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixel-pro.ru/upload/file/36023859151.pdf In PDF document text
    • http://mardeestilos.es/fotos/file/mumawejijuxofe.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210815_194630.pdfIn PDF document text
    • http://domplus.su/userfiles/files/15805233328.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/keranidavesoziverubalufok.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/favunewobafobapi.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080273f79723---5568697951.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/25314377850.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/lavifo.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a31dd0e328---44193392582.pdfIn PDF document text
    • http://learningkey.org/userfiles/91323955305.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/81860887835.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/15342068022.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/9311eb021080918530e067a09a8f1d5a/36856143826.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/61077574662.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/51a4d703921eaecff4d8cbbc08a1d383/53176002440.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wubizerafirenuliziponum.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/numifaxajetatedozarikikez.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa6dd061a0---36902370071.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xejulafibitej.pdfIn PDF document text
    • http://ezibra.pl/upload//file/43602501772.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610a6f25bf43e---lunojagimilegenoni.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/37865015091.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/bezurokojuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=coagulant+chemicals+for+water+treatmentPDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 11000 bytes
SHA-256: 763309aa5103c767bb4976efbc860687a01223e6a43bc96952f2cbef83cc1eee
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 18128 bytes
SHA-256: bed3b581983d2020240067ad8c259c538df89771a73e68cdbc505acb2345904c

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