Malicious PDF — malware analysis report

Static analysis result for SHA-256 67af8ef28055e9fd…

MALICIOUS

PDF

94.6 KB Created: 2021-09-06 19:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea1c98f0069f36faade64ff175fd9bb7 SHA-1: be009c99d92012e9d60504be0553959c966811d3 SHA-256: 67af8ef28055e9fd6d9449b239c55692a632b3088dc9d3f11fe106d83e1bf0bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://geose.ru/userfiles/file/71178635829.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/36e581a578edcb423d4d98eefd8ff09f/94151902388.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9400d2beb---89003284790.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/gvmnopav4qugfnb9pn7reg1kil/fidupagamuxote.pdf
    • http://ondrejkocar.cz/img/file/virado.pdf
    • https://karinbentum.nl/uploads/file/50027659419.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ea90a95f35466059c887515ef15ca32f/xuluwowulowoxolinuv.pdf
    • http://hy-concrete.ru/d/files/zeradaviweboburilojunumet.pdf
    • https://minervatech.work/js/ckfinder/userfiles/files/58867180662.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/11369637552.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/vogun.pdf
    • https://hogies.com/includes/template/uploads/file/ridofelodus.pdf
    • http://eperon-kochersberg.com/img_db/xijuta.pdf
    • http://kasargod.net/uploads/file/zovoxokagikelebagoropos.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b9a826c2cfe5eb261129d224432a7be4/8753576497.pdf
    • http://allycatering.com/userfiles/bufifebazeburupafekotof.pdf
    • http://rainhouse.kr/data/editor/file/1723901817611d2b09665cc.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb59118008---zegutepofolamonozagek.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5961ac9d---98360621778.pdf
    • http://knuhpharm.kr/userfiles/file/20210814043332.pdf
    • https://artenika.pl/fck/file/65978716929.pdf
    • http://arniestribu.com/campannas/file/lelobofarobasufaluko.pdf
    • https://mn-lawfirm.com/box/userfiles/file/zidokexanidelo.pdf
    • http://studiomistretta.com/userfiles/files/12642794603.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=la+richesse+des+nations+livre+2+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_off00010456.bin
9b396c4c9ab5a58d7fcbe83af7e1fa0fe9f326eff968ecee183e32368df5f764
pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 21940 bytes
font_01_sfnt_off00013b48.bin
c0f70b557a12208557474d2bb97b0e5a9044e56d87d743dce6ecef95b911d663
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B48 10860 bytes
font_02_sfnt_off00015460.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15460 16792 bytes