Malicious PDF — malware analysis report

Static analysis result for SHA-256 758bf3e1af25fcc3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 23:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 113da91160bce86d8af1ca721a544c69 SHA-1: f67445882e7a6d7254a13a0b1c6d562a246ada61 SHA-256: 758bf3e1af25fcc3466e1c8d67ff0478cdc3e86bf4320bd6702674947f7821d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://drafthe.ru/uplcv?utm_term=cbse+books+for+class+4+free+download+pdf PDF link annotation
    • http://mrsjamesirvine.com/clients/82887/File/dusemaxitigudevojakuj.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/ggeuoj6f8bq92arrpi655258ia/97251844383.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/bopel.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/24907376032.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/22037602365.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/41418280059.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/13653456741.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/tenidedamujovexubipuje.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a9645eda428208f5a22c9e29cc0459f8/towotepanoxuwafurafatu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/menojufumuxabifudijila.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/68722907423.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094e5e08dd39---sajawurenud.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb68663453---jozuxerekifosuw.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tfemr9jfmrpcropmugffeqqi46/17695526520.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ggouuuij6c6cpgkqofu7ndb9tp/xexagola.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/1271847659.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/23677013225.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086e88355800---xifojipuleranisosaridep.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/ngqqogoemfh7n0eg3ootk43j44/sosubopedasadi.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/pegerawuxarewunubix.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_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 18932 bytes
SHA-256: 15f48f61d6985e6dd5e78c672167dc855f5a0849e348b1d3452c2180398e38f7
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10852 bytes
SHA-256: 2d5b4d8437c203f118f01e9c119769c9d8181390eda6a4824c54aee2126821ad

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