Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5641a0cc18edfdd…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 14:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 62f694c5adbddb4489e6696a53eb5ee5 SHA-1: 449b40e00383b988a3c3a96dffdd3bb564c27578 SHA-256: d5641a0cc18edfdd01a5f943f2e0e206e20cb2bcc5ee89165420b41ac3d7182f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing or malware distribution campaign, indicated by numerous external links pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards the document serving as a lure to download further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=the+courier+new+vegas PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2e1inc7ers71t57sm66e2ke8ha/tirupotowitujelegin.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/silodi.pdfIn PDF document text
    • http://fourfoods.com/images/files/xutunududiwumakodus.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/judijuxovazemodazonovu.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/15889777065.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbfc054c4---34752501640.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753a6857e81---nolonuzupikofuvebapi.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd75bebcb---botuv.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/ledetuxu.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/daguxozokakipeludega.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/49547738583.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed26e86d62---kibenobitosifuga.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/50168def6b19e963d8bb6ac9f4cfcf59/mutegiton.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/so1orhmh4a2ivahrdeegeugo73/lovotagelubuwuxiwa.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/siluvajeba.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/43931663564.pdfIn PDF document text
    • https://andana.us/files/files/11783397955.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/06d59809a1677f05a30a46782f200511/92688210989.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/91435120588.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7efca342eb---lubozaweganumudijenu.pdfIn PDF document text
    • http://demkapi.com/resimler/files/41277207473.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ntm7ie9460t3jgam1rih6kct6o/79537602064.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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF520 16440 bytes
SHA-256: a4e68f6d11918daeb9618e74c3e0a509285be53d860798f956297f897f65b2ea
font_02_sfnt_off00011f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F36 10580 bytes
SHA-256: ad14164361127ec9a3dc2b493ce811c5cfe61bac4aa1e844268cbb09a69a33b4

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