Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fb1330aa4d7073…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 11:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 172d8dec88c6b2707b7f99a0eb7869ee SHA-1: 8678d253ee5cd62205ff335b1b35a891c312ae69 SHA-256: 98fb1330aa4d707303aa1de0b6516d3b1a0109773bdb4cc7772bac7a8c6653c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to what appear to be compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request, a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://infrive.ru/uplcv?utm_term=propagating+aloe+from+cuttings PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/1e501604dd078d2234e412b7c983ef6d/sopabuxisamaror.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/bolur.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/30845387420.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/fq3imjhg41jc3848ska5ok2n66/32301588102.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/kijurajizagofej.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/84l6v3lnirbtk536l8d0i09jr3/30803617740.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde61837fa---vejurajined.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/43172009956.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/3198463996.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcfc9c711---vufuse.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/73297050276.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090f066d83f3---21374543946.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c901f639b3b---jasogalidamusava.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f31dda8a---bafizewusujiwu.pdfIn PDF document text
    • http://dalaichau.com/files/lomake.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/81488019697.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/ebe48dce4e848cccc5453b029e15e1e0/35593853209.pdfIn PDF document text
    • http://vodnik48.ru/content/file/pivub.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/57479512714.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/viwegefisorulonu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/54162272995.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/46667827921.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/pojazowotudaxezofabek.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/78ef02e358c3646075f9fb693d708204/weviwazikapesimavefetagef.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59F 10924 bytes
SHA-256: 515d68afcf90ffec8a76a021d12d040c62f58b27d9961f86b3acfcfadcd808ab
font_01_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 17528 bytes
SHA-256: 08e6472e6189db344ab808d62dfab2589ceefabbf82464fe4c69e559a0545911

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