Malicious PDF — malware analysis report

Static analysis result for SHA-256 7588054cd307c8b7…

MALICIOUS

PDF

90.4 KB Created: 2021-08-01 23:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d37535ec5f7b31704210e68a648a203 SHA-1: 3f202e3fb24233446acff36162e85914827a2064 SHA-256: 7588054cd307c8b70979d41601f3a99800268e6b278f30a1f67f2d0b74bea743
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=tws+i7+how+long+to+charge PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/74cf3e9114885f87f5504ff8a75c0aaf/wemosozuj.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771da483039---89134469401.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ujcbv9disq7pkvuij4e35f2j94/66734402013.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/93047383610.pdfIn PDF document text
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/91831763096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e77a3f01f9f---mawuzadenolojawuvo.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/mliishd36grg023gnm6un8t3mk/79808943438.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a29b99c0dc7---sepekexi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084976049bbf---116316326.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/xidewizowizuj.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/filazepivasutulixuzufi.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/36945761817.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/soviwebowujuvebadebasug.pdfIn PDF document text
    • http://gptools.net/userfiles/file/36279925497.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608506f6db227---81031408309.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a9d54c9aca3---zijajawuloguxaposizu.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/61302619791.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2a4gitlb2jcbsibpt81737q1cc/77682810924.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ba0c9cb74f43a70d21608ce08aadf305/23194299912.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/gejirumedidopesogevakab.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e0c9a2d9---73908657588.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090331385ea1---8470378713.pdfIn PDF document text
    • http://mldinsaat.com/image/files/27652183434.pdfIn PDF document text
    • http://glastergroup.ru/userfiles/file/vexefe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8043fc6797---gebedenixelad.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10608 bytes
SHA-256: b883d44eaf51a20ccc9084f5d4dac5058f8f229dd978f7aa5526de6b7662d849
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 18700 bytes
SHA-256: d8baf1640324da31407163c943752e3ac27d4854971fa8d17c991a7f4389efb3

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