Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a099b71596582a8…

MALICIOUS

PDF

108.8 KB Created: 2021-09-05 11:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca22f47d3c87a0adcd2f5d8124a5944f SHA-1: 929b3eec8f5931f8bc251e4c56b5ea92e7dd8ed9 SHA-256: 7a099b71596582a88b72ef594e645126e88d1cf00c29a63139237270cf2e8780
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://npi-management.org/ressource/site-image/files/25204529522.pdf In PDF document text
    • http://theponghop.com/upload/files/bowenarabejomafukufudowa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/45e081c148bd6d5b0dd4cef1b9d80151/5879945617.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279e3d6da3---78321279593.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xagukezudezaratupaxuxibu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/momuwoka.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/25991047338.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/metogekifojugefotodewipex.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/sokezujofuzunozimuv.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/wavisekofexipikona.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef609e3052250a2debcaf4d09a6a2484/35573769926.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/puloxutotuvipomabopit.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16124bdedd40bd---38192536290.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/11687616054.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lrscpc682ejc41t2o0pee2pb56/zidukiparogixa.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/paxiwimasakifusajogamo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/sozekitoxadu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e875f20418---tosovugulevikazon.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ff86f021ebb33cf02fd08da897495597/17466060100.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/benoxogidirikexavezigivod.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5346591779---tagosatoju.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e5637b4fd---raroluvebezutop.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/73159359149.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/25288991.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/dotetozapadopatoga.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a264f4a499b---nawaj.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607edf610f98f---31498464167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=drawing+for+landscape+architecture+sketch+to+screen+to+site+pdfPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/47409043310.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_off00013bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC1 11176 bytes
SHA-256: 759f37c71025b6ed78820f51e4ceb69985aa869e385d08c6c88f4bf4ce473f73
font_01_sfnt_off000155b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B6 20992 bytes
SHA-256: 5e4a1889f64bc2f1334c07380e4ed36302aad20f5508428bc52f2fc370d33760
font_02_sfnt_off00018c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1