Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a42bffb7e35d03…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 08:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 79dc7834006f970ec4e568698418e2e2 SHA-1: 5c50cdb7c939ecad89fed56c49a6c3df3692d79a SHA-256: 94a42bffb7e35d03c6715fe0213f042a2c8e57afde6a33931655b4f6931b93ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but the heuristics and URLs strongly indicate it's a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://agcslohian.com/userfiles/file/59054404623.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9404b210b8f83fc7120cf1bad04227e/31239001705.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/5btas8d9c2pc94cqsu20isukir/bevaxiruvifazadib.pdfIn PDF document text
    • http://boki.hu/editor_up/fenufofonesasemoviga.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/gojewo.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/biwonularipoditexoriwivi.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/gutetek.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/26316694589.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/29081732025.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/jit694u0vf06onp56fqtasbnfo/87040239365.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/45831148317.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/4498503842.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xopagapupuzube.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc780efd---lojujuwebufugazoku.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b899a348d61---49528830639.pdfIn PDF document text
    • http://turnyras.lt/Files/file/52783407864.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/sunazasukorexuxi.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/35890119556.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rp321d3vcsh8cne6npk878u514/98866057832.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/4189557558.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098334683857---ridezimos.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/55514676435.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/71468240694.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/98437067661.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/48322092410.pdfIn PDF document text
    • http://metrokentakifinan.com/resimler/files/90891760863.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c3fa0221f---31372709929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gender+inequality+pdfPDF 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_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 10604 bytes
SHA-256: 564813ce4cc559c7620e7ed75299676b7545ca3e13a3757bed9091183f0f0014
font_02_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 18420 bytes
SHA-256: baf48557797c45cf9440642997ee667f7b9f0b42c7feecdb0a7b8cfeaaefb85b

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