Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0f67464700ccc7…

MALICIOUS

PDF

85.5 KB Created: 2021-10-07 14:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c70826d1c2671b621c5c3c45ae6ef3e9 SHA-1: 9394d83ef9a246ce27e32a206de8f1d187e2ea8b SHA-256: 1f0f67464700ccc75bdcaaf2ec41e6c970e05ac7905e7f391b3ee0f18948de70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malicious content or visiting credential harvesting pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=scan+to+editable+pdf PDF link annotation
    • http://shiraz.sk/ckfinder/userfiles/files/negewijuxavanuzipo.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sekerokunopibebivitiw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e22c3239b3---7946285365.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/oca1ja9ocp4djbrstf965f7iav/jezanufadosexusonusik.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55656399065.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210914_0205813DC7F6BCEE.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/6916899858.pdfIn PDF document text
    • https://mimpishio.com/contents/files/895682822.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/55613849219.pdfIn PDF document text
    • http://home-plast.ru/foto/files/menepumojunibog.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/kamotaneleripadijumuwu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/6b7ac391de6e3353eafd1e9669b58872/nulexovusuvusurenaga.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d1c0a3ab18---84955882261.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/62425283967.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/53422541761.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/52266391987.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/88688157267.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/7b5582ef91c8b8fa34d9729a75865fd9/nutisibezexowomimekoseba.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/19681049203.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/30667865054.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbb99144e3---81584603894.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090422585468.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16154545e6189a---88584571864.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__614F33479C31D.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/pasotidegelegiboge.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 10560 bytes
SHA-256: 4827e1857dcfb6c2ebead6aa6833b1af1a5c1ecf660f891b7f160a7edf161033
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 18632 bytes
SHA-256: 20d6241ba890af64fe6559de864894454cd3711cf130bee72b3ce14de80af6db
font_02_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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