Malicious PDF — malware analysis report

Static analysis result for SHA-256 dea96a41ef1e7b71…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 13:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0b023e69e615ef67b7ed267ef35a788e SHA-1: 357cea44d588d94ece73740f3620a722085ec436 SHA-256: dea96a41ef1e7b71cfa28c1327244c177ac1c3c3991f40dd83bc963880ba6389
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the attack pattern of using a PDF document to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=thermopylae+the+battle+for+the+west+pdf PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fbcf28341e935041cb61c2013728feaa/duwoduxeki.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/36882439459.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0b3b6116---fizatimitapisasof.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/68771502586.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070517004653.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/tebofonixej.pdfIn PDF document text
    • http://keacg.com/upload/files/xitog.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210814044837_agxnw7.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/lufuvenewuriwanesafebib.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/nijol.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/fufugag.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1337090552608cc09b8d9c3.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mpauep8bph842ndt3edfqlvp35/1570792003.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/vorawoxuvimixa.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/81307931125.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a0ed8d623e59cde026375960bcd8dbba/36425015104.pdfIn PDF document text
    • http://alltechsro.cz/files/xegutivetogiki.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160857b43210a3---lemezabezefagivora.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/51648565585.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/8865c4lrjuic6dl7bqn4sqih35/tixexa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/10736078ba7e9bc009f3ad15e4b9234b/16394784892.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/68448098640.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

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_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 10872 bytes
SHA-256: 2f6f5f2654bd61ce7449d2a3fdaf8241eb08a7701d2c554b84506927cec15ab5
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 17148 bytes
SHA-256: c222c00abe890161bb8ec376b24b5b14f92f310db745e06986f34d53d0ceacec
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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