Malicious PDF — malware analysis report

Static analysis result for SHA-256 a877b2afc7ea1b0f…

MALICIOUS

PDF

83.9 KB Created: 2021-08-30 09:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7cc776ce928f830410fb2b9b6673ff7a SHA-1: 1cd4aae40ebb069ce120949ff844e62434a95edf SHA-256: a877b2afc7ea1b0f5744cf6beb8c389135f685820f40c38514f233121380a1e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a 'download physical fitness certificate' URL, combined with the ML classifier and ClamAV detection, indicates a phishing or malware distribution attempt. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/deqcmf7fijvh84jphv80poink6/zirunavegag.pdf In PDF document text
    • http://ricarda-allegra.de/userfiles/file/21803558036.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/44lq2ubbm775ltjmooc4t27g60/66586483991.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af373a15c3---10226970980.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/lunonek.pdfIn PDF document text
    • http://pjteam.hu/uploads/88788833115.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/nasujixajurus.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c19f394af---75960787016.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161194e4910c85---52996825786.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/492d928d692be0eb04e4433adba000f3/3103607268.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/99241617250.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3f3cc75ae3e4a7060eee6a3e6d8172ad/sepagekexifarijubuloba.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/mupajasinevuxodebapelowa.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/47352564190.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/52753105dac376cc88d487979447a016/zapugepaporoduwimiz.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/hk592g09brfdbpd29baml500jn/kutumusofapate.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/70793769081.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/96681734174.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lss3rk1h5d2ne57o89c711ugf0/52576045048.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7a3cdb005---rigarimixasezoxotopawa.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/136429308ff068a3d99cec3924dd6037/18741274534.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e6914ef55---23125746041.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/941fa06ddaf45f8fd2c2985b16c869ba/37344832687.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cb5c6d305b1---39597796672.pdfIn PDF document text
    • https://areicon.com/images/file/47159768339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+physical+fitness+certificatePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF25 10916 bytes
SHA-256: d94b40c84a24a0b237a4ad37d9c92ec5b1e70c836567eada108e40fd87e78dc5
font_01_sfnt_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 18100 bytes
SHA-256: 7b2cdbed427e2b9ebd73953aa44452d08372f6b8eca79f91c5b62619cb76116a
font_02_sfnt_off0001272b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1