Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f98ba6e792a82dd…

MALICIOUS

PDF

87.3 KB Created: 2021-08-22 05:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 33829d349f07f6062f1eb5ce8e4f3671 SHA-1: 0df5234e262ad8805800b519fdc3f2985110d43e SHA-256: 1f98ba6e792a82dd41543265c7508b6448c391170d2f68d4245213f84bc43525
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/cd7f9aee1553973e5844f588079aace8/60623112659.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a6c0ed43aa0cb516ede36af186c82e6a/gabijuvaw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/99789441023.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/vuzorirevurozopijilagumus.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/49940213167.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ede622a19---97999900916.pdfIn PDF document text
    • https://diphong.com/uploads/5877036940.pdfIn PDF document text
    • http://dongsachhanoi.com/webroot/img/files/sesabumupapetodut.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c37c958f332d531c26c1544c900d04b5/mubofegaxewoduzimetazebab.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56bc75503---67884018267.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/50580abacc7d4ff96347bfe464c234e3/33779773029.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/7fa4e0d730e8801c7bdf0ff02f157457/35095456653.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/91841550614.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1k69psa1k7l4p82c2vspc2ak21/kuwixiwogojodezazapop.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/rebudowugatelujiji.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/70486825014.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/lg1pddg29l2cnh0h3u0uqaq36g/varadodavifajigafuwi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/91091097307.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/pugazufupanejevit.pdfIn PDF document text
    • http://citranco.com/users/files/sufozezegakuvafukirokat.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9f01fd10---75318402570.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b58f666f8---xumabewubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dungeons+and+dragons+basic+set+1983+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 17312 bytes
SHA-256: 1bef5ed97ded2f32c3ec7f9b1bc212cd78a88157e53d5b402314db110ab614e1
font_02_sfnt_off000133ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AE 11592 bytes
SHA-256: 53ab5c66e75934eaedeac543d1b05a760d641f87434c72097dd02c57b56785e8

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