Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba356a2d0f16b2b6…

MALICIOUS

PDF

88.0 KB Created: 2021-08-14 08:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e8b9e6d74dfee0ed454909d1c1bee058 SHA-1: e66ba22b79a8631c9a0e8e0c68d0bc5a982419af SHA-256: ba356a2d0f16b2b6a748b32f66df6f633fa3edeb5f8b5abc973ba814435e2ce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, likely to host or distribute further malicious content. The presence of embedded URLs and the nature of the heuristic firings suggest an attempt to lure users to malicious sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2f00d53e59---19193491266.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/futegizageg.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/37539563976.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/6d81326dd62a901cfa3cc74a83d04dd0/gunowelabifiregi.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97451062672.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0649ca0368b2e7c79cf5576ba24f2a39/raluvowoj.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/38217226096.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb45787bfe---29363916777.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/41208449320.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/4c6a063a162a2fcf38cb4fab40c6d344/rinujerawifewo.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c130fa2a245---49789812818.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d203df88413039051b7fc8ae44ffc304/fezawijerasikovoko.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/87473287861.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/39700392839.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ada9ad3d---54020031152.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca558f3969---xibotolomivaxodik.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qbirbre126lu2q78p5msr4ah1f/38249514362.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/zadazaronapakule.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/jawewavagatap.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/24296147504.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/xokamavogozirufusi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085260bcbe83---65832720763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clean+a+thermador+electric+ovenPDF link annotation
    • 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_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 10608 bytes
SHA-256: 023f2dc95e22ee8f8ffe820c387800ac29f92a1ab6566dd6e03f6ec39ad30803
font_01_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 18848 bytes
SHA-256: cb98339651df1016b8a68c07f5a979fc69f7b1083be5da9c104f864665cfae9a
font_02_sfnt_off00013aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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