Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c544dee1153c780…

MALICIOUS

PDF

87.2 KB Created: 2021-07-02 11:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4c636be2767c94db81f2bc339a5d02d2 SHA-1: 7fd30a61fbed3f68ee036b8136aa06c679868634 SHA-256: 4c544dee1153c7805440193a6f08cccbe1e54933122a99b3b74c18b9269ceacd
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 CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farm heuristics points towards a spearphishing attachment as the initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=answer+the+questions+orally PDF link annotation
    • http://banphimchuot.com/userfiles/file/36158216202.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/saregusumozofulikit.pdfIn PDF document text
    • https://fallsplat.se/file/6030457458.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cdb830f92750e8a03084beab5f7fa8fa/74307784611.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/girogejimevukasezesuf.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/83734097478.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8144b094c4e8cf240d5f7609e3a73f21/ganim.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1c71f7f9a1f35fefbba88ac33dfca1dd/3357203918.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42d858bb540ac4f5c6f451787fa14202/rovipajed.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/cf47aa8aecab373c56d106e3ec3ad22d/nefukugot.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608909c7b8f70---rozosupi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608294a509a7a---watobu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/f5f313ea159d9603692a74a4738165ef/54932659884.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576efb3645---55317445658.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/r1f6ljjpenlvgghrh6h9s6m153/34296934700.pdfIn PDF document text
    • https://casentinoshopping.it/file/27137578576.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2f3f1cbe816665684686d389f0b05825/dupepudowojilidu.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/68170958760.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lovufalemode.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/53598762611.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/168f8b4aacef7c18f1c9a617385c53f7/75563471090.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/sudasuvixazep.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/rejuvodalilazakalas.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_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 10632 bytes
SHA-256: 7b257c3beb7b9bbacf05fe59fe662512255221e2a3712df3bd4c7f444b4b838b
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 18600 bytes
SHA-256: 36a15c595f6f2835cd146ee11693fd8dbf53ad922596519ae83fcc7626db61cb

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