Malicious PDF — malware analysis report

Static analysis result for SHA-256 503528955406c2bc…

MALICIOUS

PDF

88.8 KB Created: 2021-08-08 23:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e463e2422a928415f15113dba7dc3272 SHA-1: 937cbb8c980fb5185f79fa94301cb83b6bc443b1 SHA-256: 503528955406c2bc0e3c7fd7dcd8c8278d133becacbdaa5b2694e7b6ee5b4bc7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=captain+tsubasa+dream+team+download+ios PDF link annotation
    • https://getracemirates.com/userfiles/files/62584672668.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7d6b8f89---28049979884.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3732cf3b6ceb1e7d93634b9551c05db8/sumof.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/20b3ffedf19494c790984d6885f27d59/10541805316.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/73226332033.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/23754310916.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f93746000e2---sesajuxapasukideweneludag.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a30b5b6161---mubuzupetupalutu.pdfIn PDF document text
    • https://dannysacademy.com/ckfinder/userfiles/files/lumojexupemuze.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/93318850966.pdfIn PDF document text
    • http://air-ned.com/uploads/files/5480857211.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7815089fe6---4374666470.pdfIn PDF document text
    • https://masukpt1.com/contents//files/nefamu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff76b09988---rusukapetej.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/2368064150.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/xevuvi.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zikodewisofoparezefi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607470234e861---savuvodukejimijazewo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/tuqojp9jrli7c5vvouvuk8c1at/60411309547.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/purorifubugifesofudanovo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/c94733ddfc90db53137a9ae449c48958/14591577417.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd52034b1f---38781036289.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c695e6e8c4---manapop.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 18180 bytes
SHA-256: 098418b280c99ec6c872cd6435003d02e40c2463012959690fafb49606bd7ffc
font_01_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 1676 bytes
SHA-256: 08d3d5576007ac795ae6719f21099a96d4af1de6057acb6b0f60637119274493
font_02_sfnt_off000123d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D2 10912 bytes
SHA-256: 7e18f89cfc6a8ad41e0e8b470033e98ccce825e091611b875825157ec9c5b672
font_03_sfnt_off00013cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1