Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7a8bb485bf544d…

MALICIOUS

PDF

89.2 KB Created: 2021-09-13 02:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06adedebcbd5f402b161cc68183dd7bc SHA-1: 37af2632a0a1e65d67858271cb5e25c546054b61 SHA-256: cd7a8bb485bf544de124dd80ccb786a3b937cb53e5722f1418d4f33563f3f1fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs are likely part of a link farm designed to redirect users to phishing pages or download further malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://smidgel.ru/uplcv?utm_term=play+tank+trouble PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ebe80926c83bd8a2d114f717f4e5d004/dedike.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/zapedomisidutalemuxu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/38915133253.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/1907592286.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/91320034895.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/firenudigomabidasasam.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/putuj.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/6713867619.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d636d5e1a275a38c8c85a3f6161a7825/mazogokakewopofoniz.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/lutiwini.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/zimuvizukokawosoki.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/81297167555.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/6925c48cb2c41cc09e7b41460a770d83/12734707797.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/38039443877.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d92a10166b1f91f79a120c25b2ecebc0/xezofotutusafi.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/93640525252.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/tivujivuwemi.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/nixidebepulu.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/nugajopejogosorodogawo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16131fa32060bc---55593038207.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/72511847429.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/robipirizagasoz.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/tepumexiwajeminep.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/33773101482.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c165bd17b8---8123570386.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 10288 bytes
SHA-256: ef1194388ffe03d161dca0fc86cd8fe383d92085141c3a230a2f2a74b6171f6c
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 20448 bytes
SHA-256: 4ae30322a9be4ababa8f4abc952bce23bc606d07851ff75d4ee28fb0f4cc60d9
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_04_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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