Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7258a02141a173b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 11:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b38e77594d85e778d9369bef31b6664 SHA-1: 399f011c5f1dce62d3ed492661a2f18e4eec4588 SHA-256: f7258a02141a173be28230e67d6dff7579a0f73aeee76c86ac25ced60186fefb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of external URIs and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=natural+reader+text+to+speech+mod+apk PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161406e662c391---vamorosag.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/23678263943.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fowowijovodega.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/32004442645.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/8631fd2d1b8ade48a4604ca0c4eb3a4e/dixipek.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/ribuvepova.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/zaxogewizis.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/56794706536.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/dakozuvibi.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/maruxezobevegole.pdfIn PDF document text
    • http://kaies.net/upfiles/2109181614489573681g8h9e.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210905181922.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d93b3d2dca---karixoweteje.pdfIn PDF document text
    • https://mollis.rs/files/56754045376.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/44153484794.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/62714881774.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5687879f---jiwitojegipiwajewibak.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/givefofub.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210910090815.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/zekifev.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/av5gj6de5bcsjq8fp373mk4rg7/zewidizo.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/45798254063.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///duseluve.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/44224245407.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/24009382903.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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 16880 bytes
SHA-256: 7ace0c25aeebf603b9f8b648fe2778974057e5ae5c05c89dd05b3f70d69f641f
font_01_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 10856 bytes
SHA-256: a25cd4b4c71bf4680056d32e8a050f0cba72c71cd06d5c143e537cfd191ba651
font_02_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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