Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e4743de39462a8…

MALICIOUS

PDF

88.7 KB Created: 2021-07-02 10:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 492d3c6fae630be92ca21413f418a291 SHA-1: f22e4bbd77cdc3e0893cdf2c6c378cc574b1022c SHA-256: 91e4743de39462a8ea7fecd075e37fb096903e274ea912dbed732e97b908bbd6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanning. The 'SE_CLICKFIX' heuristic further suggests the document may attempt to trick the user into executing commands directly, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=recover+pdf+password+serial PDF link annotation
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/14601a6dae18a31c7781551e48fe59a3/dokogo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/60931820359.pdfIn PDF document text
    • http://cke.hk/userfiles/jilitumuxolipa.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebabe646f5---zenumokozeguriwekatof.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c6f3c3564399e036bc187fca8fcafb1d/narabiw.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa88b0adbf8---mujikavekukeravi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095490b113f4---6894706796.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/12084336227.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0a223f11a---31524218209.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/zobuwalus.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ccnoie6lekf5t5otnjqg15tkf8/jezidew.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/40979478440.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/20069886514.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/kewazim.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c2657df8e---92063814676.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/9fec32necc6sgaaf3qf1rbe7c3/92591359684.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/93qc3uf7ek6fg4h7dg5efbc0ur/19989072412.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba49f254d6---77873701764.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/24809677571.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/revegafataxodiw.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/vavalewamezulesodamot.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087742a093d4---sodomaxasixulimesexezalav.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nnscqpdd9sbp3s7acagje8pv01/47177666064.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_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 10608 bytes
SHA-256: e1729404e9c8efb600ec9ecf6f99b51de31e1fa14bca4f88409e0b06c39e4d1c
font_02_sfnt_off000125a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 18300 bytes
SHA-256: 23d8cfbf862fb32afbb976f5281ce8b3e7a024612aeb2249a3321ec53754f42e

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