Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c637114bda91e84…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 02:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 60cbfb3f3313d29eff35bb311284d4c3 SHA-1: 43b20a59861be8ea1a1c80b191e294d3592b6ac3 SHA-256: 0c637114bda91e84d55a7bf22650a2b4ea9a9a4dcfafe3fae55a34769db9f476
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links are likely designed to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1dd85ecb4476200225e01e9e8928246a/bemepewimijamuwipokuf.pdf In PDF document text
    • https://medsplus.us/admin/images/file/sisefetiwop.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/12f9555891388f0f9e776704e566e95b/rilufokeja.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/kitajizoxavemup.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/fb7cc8a9fa3184cb045db573d41b837b/62999930667.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/0abdc7c0e77a00618c18e8fbae971365/pozadadidajezuvilewa.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eadc6a84cb---88786347631.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c198df052cf---bixifaxomopogitadizemeb.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/fuzarig.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/jilexibupij.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8141718b28a8f61cbb246de82588fbf6/biwiv.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c827233081---derakutabuluxo.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/54c3a6vfmvg1j1afrta68p5rhb/zikomegasaj.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5c7eece303d406e157d56d1bf8f5a658/pijegadizomeduvamominatub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b575b0a876---86677493982.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72590095696.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/somogilamewif.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3043993c3b8d01b13b4fb066cf08f3a4/remetuwabatizilenekov.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/8oain472pela1dr3205j7q43da/69391271162.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tepabaro.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dd795cf90---35894787046.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1c04b6d57---rufigesen.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/82777741407.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/397827914.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf213c69ea5---6990634613.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/f27521dd8ac2bab947deeafeefafe46b/gikenifunulafefapilutite.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/23883580376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=game+of+thrones+s8PDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d55c94aab0---deperigipirem.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_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 17192 bytes
SHA-256: 85454beb23e39035aaa0c09d7f64464156e186adc50440454c2e6ff3d0d70a38
font_02_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 10588 bytes
SHA-256: 4dbedeb1c154db2a8c4a646394b4b6fd9cbf502e495fa255e42ab3e486adabe6

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