Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad244c7079a7c393…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 18:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 462638bf58b2bb14019a3120e4c61b4f SHA-1: 497cb275ecacc30aafd663f790abd2cac91febbe SHA-256: ad244c7079a7c393aa4e5d3e1f5666a0cb966a84193d127679fb134ceca8e70d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The file's structure and numerous links point towards an attempt to obscure the final destination and maximize reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://pixomot.ru/uplcv?utm_term=wide+sargasso+sea+notes+pdf PDF link annotation
    • http://amsasecretariat.fr/userfiles/file/vumizidetoruso.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/sipogazalolafilazi.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/vubapamowoxoluxud.pdfIn PDF document text
    • http://akademibt.com/resimler/files/8019283006.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbde3bf0ff---94761048578.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fb2a98545b14e6d55fdbcae2d064bd14/sapawugudasuku.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa21147ef9---jizumewifaxasev.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/101249013927.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/4e15b82ad778b9bc71a3eb71254185d3/zavoloj.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/13578186857.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/1204119274.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/63980853643.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vifazepuzinibusumofupelu.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/55199097766.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81b0629f09a1a4b7b3b27b751f8c77fd/86501135727.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc5c497ae---18811167064.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b22677eaff3---71221052937.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fd323789---raridasabenimaba.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/44emelgrakk0lekmekn0futle0/ridokupezuroxuguberem.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/kumexafas.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210709110319.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/24765447413.pdfIn PDF document text
    • http://elitk.ru/_files/dubebozizorubugurudizux.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d54591f22---27838515903.pdfIn PDF document text
    • https://x-software.cz/data/file/27908784477.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/82886800164.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c374f7cc---dorasa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 10620 bytes
SHA-256: d899087ed1a1cd937de92ea5ed0b944aa70edc61a8c45b9b77dd8d1a671e0f5a
font_01_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 18912 bytes
SHA-256: 14e07eeb546543922be02bc06912ea41f0e04058bbc339e072dd48795e71a477
font_02_sfnt_off0001496e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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