Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39b3b8679e73b92…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 20:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b3be136a3d6918a953cbe26fe294a08 SHA-1: 113e6caea1efbaebf15c5bf8d8f9add761b34071 SHA-256: d39b3b8679e73b9299d6f758fb6aeed9e06cb5f717c017ba2c37b9cd16407f05
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, and the ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of multiple external links and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=adult+games+on+play+store PDF link annotation
    • https://onsale.social-push.cc/data/fckeditor/files/95297409327.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/diwusaro.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/badul.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/rojixa.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430518dd659---jazozavogitazo.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/86299207586.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161434e5283b14---zoxuraporodilex.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zegesavuzogo.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/50460473973.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d7dabd6c82f8f4e31b1219e1a3de9c1f/36467262890.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/96580619213.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/55614656954.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/73446748856.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/mujosutapalalasure.pdfIn PDF document text
    • http://cke.hk/userfiles/26028267943.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/fipaxawakajovagivuwirajed.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136fe8901423---wujarataladufeb.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/vofiwubukolosexaki.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/95083855649.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/toxevetodipubowokafuraf.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rekofifusalutasufonot.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210906163308.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/60432114695.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/44964934930.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/regivinijigigubasawuxag.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/52731750023.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/33715608945.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10836 bytes
SHA-256: 6fa189a045e573ce5babf646540038e8f3d49c4503e6ba775cfe0c6cd0d5efa0
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 18112 bytes
SHA-256: c753ce7a616dd743ed519a58ab695387968dcc3e94d038a68b5d04aa90f1ffa8

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