Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f09d0a9abf6530…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 04:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a8203a3309462cd2a822e993865538e SHA-1: aba43ca389a974e17c976ebeb46b44a25f5c7916 SHA-256: a7f09d0a9abf653099083a9e91d32050117fd7c23b958efbcc5ef4ec3070a319
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are flagged as compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. The presence of a link farm suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://jotelek.hu/files/file/jadarasogetadurakamumi.pdf In PDF document text
    • http://dolphinegypt.net/userfiles/file/70869650443.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/97470678942.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2323e338d6ebe78bf447672f8a2eda32/30871682600.pdfIn PDF document text
    • http://strandedtattoo.net/file/valututaluxopaxojaraz.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/eb82c4b07fbd915aafed768f6b324eb4/10567783887.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/vibavajidus.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zovalalidebuzeposid.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210614_D9C5B7D093760E28.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/33181601973.pdfIn PDF document text
    • https://tckontrola.hr/files/risadifajebejepug.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160825aa74acfc---rinazuxopusu.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d483035cce---kexebi.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gofadazi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zurevatab.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n35jlssepj70bs8hfsvqfa9jt0/73001066920.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/46613914648.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202108/file/libanalilasitaginojuteva.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/nezuzolapowagisibatus.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/jasikesegalidabosesam.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/tf04vs7olldlbemgb4ktikbu4g/74054452998.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/kuzofonovowubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=encyclopedia+judaica+pdf+vol+15PDF 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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 20760 bytes
SHA-256: 00df738b8298040a7e29d7ae1dc34dad23cfff4b4b179b7f3b225d8b846285aa
font_02_sfnt_off00012fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD5 10824 bytes
SHA-256: 65bc6f9c20c673ea89b7e6c756fde768d7f8522bf71009884324a6ed8477ffce

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