Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4afac8aeca0d764…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 629a2980de4fc6fe8f173be888aca007 SHA-1: 16876bca660a6484dde4d34c2afc9001c4694982 SHA-256: c4afac8aeca0d764a72d0414a209628f7b4785fe6539f0f6d376aa1dff74d6d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://medicare-darmstadt.de/bilder/UserImages/file/vikibunofufizojen.pdf In PDF document text
    • http://bugskin.org/userfiles/file/22077823334.pdfIn PDF document text
    • https://digireg.org/upload/rufabegopaden.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612a526189ec1---48361845500.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf14d2e54e---renadugudi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c441d195a23---xijosuliv.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/dozud.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d2bb06eee3675d84d6faef72e300ff4/lipegiwaluzunamajod.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/33345048960.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/8302668061.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d8a82fc9---domufulep.pdfIn PDF document text
    • http://ministerium.pt/files/poxaxab.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708d4a4b117---gurudatap.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/356ce5lsnarmtmeu8urin599s8/85648415249.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/kebigoxerololala.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c2c030bda3ed55a7ac705be05a7210be/gekuwuvimuwakopujedilale.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/67770353400.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/54189212253.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/vekawovepamarovogedodope.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210627050149299.pdfIn PDF document text
    • http://mobilenmr.com/files/files/powif.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/168db4814574ddee7bf84d46ef69c8a4/xasasipujixo.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/tivuvabubaxeduxazajowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=leave+application+for+family+functionPDF 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_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 17144 bytes
SHA-256: fd116917793fac516abd6fb67a1d1b82a024d7ade20fe47ac644d855a477aa5f
font_02_sfnt_off00011c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0A 10712 bytes
SHA-256: 087b423f8c850c0cd260270fc39103aaa0b74cd21efb76c49e9d7fc3ff941c87

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