Malicious PDF — malware analysis report

Static analysis result for SHA-256 767a35c1e8cee420…

MALICIOUS

PDF

115.2 KB Created: 2021-09-02 19:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1d92bd74e4152afba75cff3158778a7e SHA-1: 32726dfea3616210b0921cecfb0c3f0fd4e240eb SHA-256: 767a35c1e8cee420ee31dd9a3a4c273305322719c1e47c86d39f128b0d2f0457
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves tricking users into clicking these links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

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://nomylo.ru/uplcv?utm_term=dark+souls+3+strategy+guide+pdf+download PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977ca30e08---28113829147.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a1cc442---12222910751.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d38646a7b5---xubawag.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/bufitugigirakug.pdfIn PDF document text
    • http://sjanzee.nl/file/37499471959.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/4290622473.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/55232267854.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/73637826633.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84ab9c7cc---98726612547.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/63936382408.pdfIn PDF document text
    • https://bachson.net/upload/file/49287868369.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kjr8774p5ufvok3j8ubqdpda4a/52755357067.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wezapevabuxelo.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/80714212078.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9313b31dae67a31cf1cb6369e87e317b/96237579674.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753eab43aba---nuwusunapilali.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/ganuzixamadebowule.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec27437fe---sosokiderumepakezureru.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/18094502113.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210611_B86D7E52B53A66F1.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/14864805752.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/39270321705.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e297c88bcd2---bibojekerimurelix.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9901ad9ac86b532cc32d53516a74bd08/6769814915.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/81759366728.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d06968dfaf---45520943980.pdfIn PDF document text
    • https://ka-base.no/images_content/file/98001348649.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_off00015d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D65 11236 bytes
SHA-256: 62cebb041ccd4d4f4f899b729fb34ddad985164f656207238d0e18bae5f64952
font_01_sfnt_off000177c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177C4 18024 bytes
SHA-256: aa5d7e563f548a5c16dee6560692de9bdd94e5038319a8760b2f609c7d0f381f
font_02_sfnt_off0001a65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A65B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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