Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f54d872ba72b08…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 10:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccbd73d62ebc60554a67191531e5d180 SHA-1: 4471d39792addb72c3282c8c01ce2029ee8d3e5a SHA-256: 07f54d872ba72b085f8fb2b6e0e6d4f37dda8fb6dd9253184e2cf64d8fe6fca4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://teifsepahan.com/files/file/tomibajij.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xodadijozivarevefelumo.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/49305df948d3a02b4c390827e18194c5/laximaxukolotusibatififo.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f196706f4---39038551031.pdf
    • http://guitarenko.fr/img/files/pomodaremotudufoz.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/304988df018fe862f84b31528853aa5f/31105155041.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/83023207255.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e0fbd5b196---1069052921.pdf
    • https://zemiigori.com/uploads/file/1659484114.pdf
    • http://lsbwg.com/ckfinder/userfiles/files/20210901/015312277.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/mepitopomadebowarak.pdf
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gusiwiwulapewulekibuwisos.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/5nc8njkgcjs82e507pri4tnr21/xoxejado.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f300520e0a---99294606459.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609443b169723---dobapal.pdf
    • https://areicon.com/images/file/kekojejudifuxizemuxudomu.pdf
    • http://sjar-tech.com/uploadfile/file///2021070511542939.pdf
    • http://magnumprint.ru/upload/files/17262774821.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944820e50da---talipemogudiv.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/difedixadiluwap.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/634ejet06qbhh17dqg65fpta9t/xenelelajoteza.pdf
    • https://artenika.pl/fck/file/35508542877.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/56996278961.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d432e9315c---weborasesomawavulewufizin.pdf
    • http://daimarconstrucciones.com/images/admin/file/waxebaxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=latent+semantic+analysis+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c42b.bin
ac01f6379d6b8edd618d81420f872ec3666a9ae63bd40deb8dbdc57dfc3baf2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC42B 17608 bytes
font_01_sfnt_off0000f1f8.bin
468ea4fae4650258fb49a0fe5108c892c521c96845ada6e3004cf3e657e86d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10632 bytes
font_02_sfnt_off00010a4b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 16792 bytes