Malicious PDF — malware analysis report

Static analysis result for SHA-256 3616cdc49b8cda78…

MALICIOUS

PDF

83.4 KB Created: 2021-07-16 10:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95d11e155b0c9ff4c179acfad88f23cc SHA-1: 5d2938b5ef27a2e501914016209003a8a3578e16 SHA-256: 3616cdc49b8cda780610a8ad2ec2cf978e7b80ce50e2859db7f15924e9019bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. No scripts were extracted, but the presence of numerous external links hosted on potentially compromised infrastructure strongly suggests a malicious intent to redirect users. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160798db0363f4---tuxopusodegot.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072016c5ad6e---mejokexilitus.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/70hbauqaekuulsihd1vvtprq3u/zozawigigujisukaxosegik.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e490015543d---72954126788.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bonupo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/phr4g1u2g3ufen7eeja90pq79j/guzagikupanigubekumodom.pdfIn PDF document text
    • http://billsky.ee/files/file/73421270712.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/68252931726.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9925c43b4c3b5b90563fd2295aed7ba2/54648320458.pdfIn PDF document text
    • https://latework.cz/soubory/lamudefigej.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acd4fb1ce91---gibimi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160882e8997abb---15807315624.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41f8e92f0---xidawezopokipilaxobol.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kafixiramat.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15210263036.pdfIn PDF document text
    • https://ovalpolycoats.com/media/somezugudetewinog.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a11c90a1028bf5c76460f133446aeef9/36490002945.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d234727a52d---mumelagirinasariwipek.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fd631183fb1e4eb0b4bd7c7d5cc2d44a/65521047351.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/wifijobifipunolovozelokin.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab763b1bf5c---12263941520.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/sejapa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7216aadff---zowusisezuzilewazar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=snakes+and+ladders+templatePDF 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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 17544 bytes
SHA-256: 35e6d4f64102632c81dbbbed8a8830e0d650f0bb75318f138b5f3ea37a4e751b
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10508 bytes
SHA-256: 228442a1f45bd15879cb834d56912dd37370bdc3f411c86702928e9ca7229b7c
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.