Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c868a9b6a31d4e7…

MALICIOUS

PDF

105.9 KB Created: 2021-07-13 17:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4197511267bc39e7f7e55e619f7def8 SHA-1: ece6899455739882c35d635d107719f7a96f6815 SHA-256: 7c868a9b6a31d4e7f0007ad1094f509e11cc588d62d9a98ffa112bb3d745a252
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a phishing lure by instructing the user to install a browser extension or update. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. No scripts were extracted, but the overall pattern indicates a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0048988f878dedd9d8ea1e81e2ba554d/jorep.pdf In PDF document text
    • https://groupburuemas1.com/contents//files/52411596961.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/60ac671fde41fb298a2fb12eb904b34d/16838613755.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/40149470728.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78fc0e0b4c---16579360814.pdfIn PDF document text
    • http://freeski.hu/freeski/file/gitipu.pdfIn PDF document text
    • https://carlojans.com/cms/file/40626409233.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/38017012550.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/12627fca16b83c4db1c8f245ac5725a1/komoxekulobamupijipetat.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2748a628a3458342a452fbbe9936c2eb/wipinogeg.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/52920297868.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/pka68jeaenqe3vutisrtrjfn6f/zapolufikeworunarapavepap.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/sexem.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/73008813720.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c78bd585b32---zonogofusugojeno.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862fe53b692---nirelipuvi.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/zukonozomozosunonerepof.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fegudusexagedaxitokumirag.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f6b46032c555f633715dd1da4fa80e89/vewazolalobagufotebe.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ghb7a88g6l6a2arkgckvoacdq1/55606988107.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/388a753e05186971984b7a1c690e3807/21024438719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ldplayer+free+android+emulatorPDF 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_off00013c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C48 10660 bytes
SHA-256: 011f472de54efcde16b1cc8e2b662289923557a21d36906b33493a22fa1e09a2
font_01_sfnt_off000154a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A9 17420 bytes
SHA-256: bc428de67ce1475d0648fa4e164ccd20e1a1b3287aa1277017abca2f2d5da146
font_02_sfnt_off0001826e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1826E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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