Malicious PDF — malware analysis report

Static analysis result for SHA-256 62f374371979ee76…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 18:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ad0358758d31491051c757f9192a338 SHA-1: 6f8748300b9779f89e0e307fa91ea412598c42dd SHA-256: 62f374371979ee7635029bff0c68abfdde6470f20775bed9971d4934f203513d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains, likely for phishing or malware delivery. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trsoftyazilim.com/genelresimler/file/sadawawigefepi.pdf In PDF document text
    • http://oilmachineydy.com/d/files/21514969664.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70674062761.pdfIn PDF document text
    • http://hidropro.hu/upload/xukobiloripavoxuv.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/venewovagejufeku.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/wodewoxakugubulipusa.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/88114461864.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/sofakanex.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/26608288861.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371409c5f3d---jezofuwenovonag.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f4ac7c68---69752071784.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/megugifefi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f68b7a3127---tisuz.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jozepimifize.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138fafe14e11---75348285714.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/43674723446.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134d06de8219---87936601347.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/terufive.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc788c3fe---zugodorimunapizi.pdfIn PDF document text
    • https://kawanmto.net/contents/files/wajumutimibobi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dd4947168bef48dd8e9f90c3927fde2d/joganozusapag.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e849862c76---90610866042.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/tufaluropinevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hip+hop+recording+studios+near+mePDF 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

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_off0000da2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2C 17836 bytes
SHA-256: 6bebe20cd1ff5ede249aaf8b3fbab78122a75aa87b69398148e460f6e55efbe8
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 11008 bytes
SHA-256: 58cbccc735bd6f163b9418350057379a5954bc69cdfa04a77d648a686dc50984

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