Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f3b0094ce664c7…

MALICIOUS

PDF

109.8 KB Created: 2021-09-07 19:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b915c7e47e99b104dc9d0307e66ace1 SHA-1: c05243a7778ac736b1dfc29043331b8a37dfeed0 SHA-256: 93f3b0094ce664c7462cb43d6977ccfe42e5a70fc83a348c839c63369fcba505
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to other PDF files hosted on potentially compromised or disposable domains. This suggests a campaign to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://sweatrinserepeat.com/ckfinder/userfiles/files/28739910476.pdf In PDF document text
    • http://gokea.org/upload/editor/files/70126002237.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/2b4cm7sm722i0pgs4vf352q9rp/56402524616.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/ruxasemujizesoluvanus.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/42780897303.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/lawota.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/80637057578.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/wipajilelukozag.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/14349271441.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/koxinoduwapogowowunuf.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c099c597d07---97339811114.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210616_F8E8E138E17DF5BF.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb3d99bcac---65920461991.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/614474289.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/19869351669.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e644d590a14---bawuriranotosaxovipomasu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/44536130099.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/90608991452.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/214c08e2f58b096f4cebd578eb840957/95890801669.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/49107316959.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/35202032688.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae36d587653---fibikofesatefupowox.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/ferewabigudelasu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/50999032017.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/mesiz.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f8d5f8a2ae68c748e658108817af7833/74243158584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lei+9099+de+26+de+setembro+de+1995+pdfPDF 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_off00014ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000164b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164B7 16292 bytes
SHA-256: 9f76f004890c494a130f420041e22ff464d83af215aa8f75aba858c68ade29c2
font_02_sfnt_off00018eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EDA 11208 bytes
SHA-256: 496e113992cb20d211dcf1f2bd07f9f9f17b1e3a8ef98b6a03c2812b038ab3f0

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