Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d153a2d7823ef60…

MALICIOUS

PDF

93.4 KB Created: 2021-06-28 04:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c4f5c8635fcf796823a0b2a2f1968e1 SHA-1: 8b6c89deb7801e5e9ff2c8bc7b4e7d6316277e20 SHA-256: 1d153a2d7823ef6049757455b4f3ed488bd0aeda57d847410f9a1c7644430940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://huntic.ru/uplcv?utm_term=significant+numbers+in+the+bible PDF link annotation
    • https://bda.ch/ckfinder/userfiles/files/50246009787.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739f7a872e1---nowelaruludexafejanu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/gupajejefoxegawesatoluv.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608115f2e8ad2---78629062569.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vaminolomari.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/88918809803.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/40deee929e5e0eb30fcbaac1f32ecb15/digivusarezewupuvonara.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5a4146d9faccae5a3c91174ef4c18229/supinixevoladusejabijivo.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092053038c7e---dajoxuwubiravebozonum.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/65830567890.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nep575635g9h7a0nu6016sdrcg/90865667348.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9760af3a2e4dff7bee4111f3df5ad800/50140379376.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/22844834145.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qtu4utk3tvuk6tr5o5meilio95/daxujetadabamekibifopo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521133140709653.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0f3d869e1215f04126cc1862d6b68390/25668168974.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/bijumuv.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609885da6dd46---mitenatibenoruk.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/46173812677.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6af0becc5f17493487f1cfc60d50ca24/10921155475.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/86192862281.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/80611150229.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_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 17672 bytes
SHA-256: 509dcae0230f6c6a20000edcde021066c874766a1126b24ffd629c6c3336732c
font_02_sfnt_off00014ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE2 10980 bytes
SHA-256: e39f33dc1ea89ad0bdbd090ed03592c257217cb18e027cf1569bb051e0865055

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