Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa8089bcf6680da…

MALICIOUS

PDF

91.5 KB Created: 2021-09-13 10:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3a61c2375dbb898944b38da31372f292 SHA-1: 042c7e0b0217652d724428561bfecee86465b2a8 SHA-256: efa8089bcf6680da3ebc1e24b85ba908c39ef6a75d439e31ce8aeb3f4fcb6ee3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting. One prominent link, disguised as a software download lure, directs users to 'http://clinicaveterinariacittadivignola.com/userfiles/files/vowaxaran.pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://vhcvietnam.vn/ckeditor/images/files/kuzegewisewe.pdf In PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/kapaginejanimepujawo.pdfIn PDF document text
    • http://techbis.pl/files/file/70263982576.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/xeligavun.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131797e099b4---3997453102.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/23285937390.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/winajileguwakuj.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16132c29420d66---16265098539.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wujekazuvekupirunudota.pdfIn PDF document text
    • http://skisun.it/userfiles/files/diligajumiga.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/75413859580.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea33892c6d---zisoja.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/zixerunave.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/ragivamutuwi.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/679674954.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/duvuguxifuroku.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/vowaxaran.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/xerudewawagaxibexaxotas.pdfIn PDF document text
    • http://rsentco.com/upload/file/jutagijopotiwubujodadevi.pdfIn PDF document text
    • http://fgosvo.ru/files/files/judobaregijedulowanewenek.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/vunakijunikoxexev.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/50909444342.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/lugokezudiburip.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d625868ebb5f1e6f2a07e6c15c9ff1ee/nivolipepasinurafarize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+pocket+edition+apk+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 16368 bytes
SHA-256: 62a682b6535c63fd3f73209d7bbbce05aa81c0bfe9b3eceef3a0e2966025775c
font_01_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 21536 bytes
SHA-256: 1c99f69c2c1f84afdbadb91303d762d41e583b4377d6ddcad19fcbd8cd16ec1f
font_02_sfnt_off00012f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F06 10652 bytes
SHA-256: dd49a2571311f78dfceafdcf98fefb89a39c54e02256f13164e19646fad65585
font_03_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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