Malicious PDF — malware analysis report

Static analysis result for SHA-256 a307f6933c98df94…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 02:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8baf7b0ff1f6cd2e94ceb086fe4e0edf SHA-1: 68d8e54227da2a80f2b81f531d2ca54428a89814 SHA-256: a307f6933c98df949a631f1121655c8e58cdeee683045533db0d896ddf776eaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure and URL analysis point towards malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tatsolarlight.com/uploads/files/wupukafufufaxowisib.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2db4345b445847e9dbcf97a9888ec3e2/85304408208.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/286e6ac5b3419384dd2019cd8673d7aa/bozetusuliwonipugodud.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/tizufu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607097ed0275d---sufinarubevalewenuzoge.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/42581526854.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/73530571165.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/basexujapegagani.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9ccd9484ff3db1dcfb1c7c64d36c966d/79268069220.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d08a3319b---51475116129.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d7c8aa00---balerimizorumage.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/jodazasiv.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/judajegerizulotositiben.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/59930214498.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_F0E30B74329A4F17.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/29debc16dd1ea0f5ec177a9c68c671a2/galelenajuka.pdfIn PDF document text
    • http://www.moyekolodin.com/files/64475954004.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d62c08b55da7c313be4aff242a0e9d04/guzogajomatididi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/xoxizuze.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/pakiziwasani.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e484c9df5ea---57577681023.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/19352308575.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2107271609227872511s5gt3occv98.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=world+time+zones+map+worksheetPDF 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_off0000bcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB8 10888 bytes
SHA-256: 548d5c13a8299eaa0e7dbb1c7de2e153d9cdd47f9f5471e97bd770706733b5e9
font_01_sfnt_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 17048 bytes
SHA-256: 8c06e63fc54fce22aaa12952aa38540e6087fdf3a04b9039b0e6c80299205736
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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