Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efdb1838c4a7a55…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 17:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 103bb1879cd5824173ce75dbd880d323 SHA-1: 1c63f730c5c2915250faa16d2314b0b9746a2c3a SHA-256: 5efdb1838c4a7a55b584161249b2da9799a9aa173bdc9193b1a3534c8dc325ed
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 functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://csc0311.com/userfiles/file/20210623072934_sri7y4.pdf In PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236719ddf73---najufevigodedijibedot.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdd5dc4d2---sepovosifepebarugoxo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/37363246259.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bc33104ee31418cc2947888fe19381c3/56221399159.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b050e2de4b6---raxodi.pdfIn PDF document text
    • https://dafelia.com/files/50168180922.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f475514aab---36675019659.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/9423218956.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/87679387919.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f40b635938d---89648144062.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d3c29f6c325e2b9214f8c852ebafd3e1/44052801208.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/18878404622.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160851f4e41a27---29516895245.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/xitegelebitupu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/kejadipurezixi.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/peked.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160775a86cd15a---fibemisekogepumalodumog.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075614ab2a00---733450606.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4af35dd5---51797447857.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/3c65a9c30602e3819d0803ce61da4db7/46687255422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%A8%D8%B1%D9%86%D8%A7%D9%85%D8%AC+weeny+free+pdf+to+word+converterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 20836 bytes
SHA-256: 90da3cae780684550b8d7d28dda50b31b7c94d1f586f803894f963011d9acf32
font_01_sfnt_off0001132c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132C 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb
font_02_sfnt_off00012c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C53 18028 bytes
SHA-256: 5978f6f7a90aa0b5be8eb015b5093995b448a6d5ad86d92559f28ae4a519dcca
font_03_sfnt_off00014891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 10316 bytes
SHA-256: 196f2a07ad2296cc72146b834bdc53e6eed1eda5caae2117853f66c04cedf842

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