Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c277ba99dff76b7…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 20:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aaa621cd4ec71468edc66170cadb6617 SHA-1: 5606f4944245c81cf0049fd059e014a1b65cae88 SHA-256: 5c277ba99dff76b767e9ac7dfa5b049fdc48196b3a3d853490df9908d4dfa3f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=will+dianthus+bloom+all+summer PDF link annotation
    • http://merlegdoktor.hu/tmp/33783157186.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/64772078386.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/dopudadera.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609087ac72625---40400200406.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a77a8316---86890445190.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f74eb4dd530---74464595959.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/13024169794.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/bitetiki.pdfIn PDF document text
    • http://kccmaul.com/files/files/jitefe.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/17856836620.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d98b49e44f---14068326399.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/96427613625.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e136ced3117---nenipetekamuvo.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/1c3d1c19e2be466e110fc81132b9dec0/jakodazemamegixopibisujol.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lezibolaxutipej.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612363e921317---59071261038.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/4da2ojfi4f96bsg6rc3lk62mto/5141234130.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/mq2jtjsv51p5lkkj5i91ecv633/5084648262.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11b331bbe---dusenaligexi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mcir4fgkpja345f9eam61cu693/66614838797.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/fuzodasininatikifetetot.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/virubobanip.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/mewupotozu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8fe73d79---29670131198.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64e9c6dc4c---tivabiwudoferevezas.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_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 16136 bytes
SHA-256: 4e17cb5e2d401d90f78d85367c4b945f13e770d202cccf388a9c99f72117998c
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10744 bytes
SHA-256: 56ed96297661bc2a3d5b6151a1e87c8980ada9b28e2c13fef00f5a9bd1852490
font_02_sfnt_off00010930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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