Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e33bc68c3b239e6…

MALICIOUS

PDF

76.1 KB Created: 2021-09-03 13:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 850cc070ea7ca4362b7581021abf175b SHA-1: 822c55b070067dffc615df6ea7fe6e5da97f4aa0 SHA-256: 0e33bc68c3b239e62b4b87770e37df39ce79f32ad08ce70305c7f1bf5107d122
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites hosted on disposable domains. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/bf45b941349332a15286521fc5821af7/31722123777.pdf In PDF document text
    • http://kantoromega.pl/userfiles/file/wowato.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/rafobikafarubu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed747dc3e1---73351749294.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086380237209---surojixexurabuzeb.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/56285426301.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160adad1dad75c---94656968381.pdfIn PDF document text
    • http://splogservice.ru/content/file/diteporasoka.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4109c29a---6819219301.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/rarovivoxademozajafudab.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dc266079---77534234471.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/56354315148.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210704_5921647D9922B605.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/13007202390.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/54673712033.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/46773612007.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbec9b6e08---70082735896.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/sazekejexat.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608755e01adcb---webovafenebamobelimetet.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2a18a633---lurulo.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vuvoburaxuzor.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/fexifawod.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/87497807893.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9144c0773d---3347419124.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e69e470c957089f70a9d43bd94b518f1/10211323667.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/xodosuwukajak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=concrete+design+bs+8110+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_off0000c44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 17176 bytes
SHA-256: 9e74c0f4fef5c501f5cbcc7510797766b13a01933fafac443d05f1b56551d4f7
font_02_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 11140 bytes
SHA-256: b5a0872b52ba0fd56b09236aba783a69830cd92b84bf26ea4b183d464d4158aa