Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ba32079ea4d4e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 04:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1d0d859f78cba80ee315ac1cf5f333ac SHA-1: c8e09ff3b9ecc93c393ced37c06f17b21ede081f SHA-256: 826ba32079ea4d4e0f268912a30871009032e70c806627823618e54c90fc9245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=hack+simcity+apk PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6e141bc6fed1df17a4ed10ac041a7ba9/rizuwesutoveponiradunilul.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a6ec4d214df810de7b6803bc92f1d9a4/49616754233.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f021419c---fekokikivijomorinez.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b50f8caa261a757cd829fb667a3a48d5/17318379935.pdfIn PDF document text
    • http://ukrfirework.com/images/file/94357073880.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/64097990743.pdfIn PDF document text
    • https://kildevangen.dk/files/72575140539.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/92b4bddf9c336f3bc0a64b91bce2e1fc/dodokukebukubipadarasiji.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/76728103751.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/74832656416.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/0c3a1b7cb663b8ee56055cf7047fac45/lumuxivowoxiguzixet.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6dca61fd1---lavofoxazejaxim.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/kitojusatubowujotibi.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/84378317728.pdfIn PDF document text
    • https://curvy.tw/upload/files/23985945520.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135caac40d1c---37689596201.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/77160537539.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/69557806301.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/runoselu.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/rakewodatitomofiwipij.pdfIn PDF document text
    • https://schmitz.cz/res/file/zekoxade.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/s76gm35jhatvbdmomrsajnsrs0/66707655525.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/gifuzemon.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_off0000c9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DB 10232 bytes
SHA-256: a1534bb11ad04ed5d90e3942da881eb465ed6a6f760f53ffa9431398d7242573
font_01_sfnt_off0000e0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 20016 bytes
SHA-256: 7f26734029bbc78b315e6cd735835b4c4185bfbbb2e5338874d55681c94f5f9e

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