Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc96dfc4ad30e741…

MALICIOUS

PDF

88.0 KB Created: 2021-08-19 21:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67a252e6eae5ec3b013aa6c88cc7f0bd SHA-1: 866c7c23c97820bbb67a6170f6728b852f184924 SHA-256: dc96dfc4ad30e741f0be378d61c468dfd82aabc74ea3720356c82fdb2f0d5dc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+to+unclog+bissell+proheat+pet+carpet+cleaner PDF link annotation
    • http://mijn-nederland.nl/userfiles/file/jufoxirakiboxefuzibigif.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb4375bea4---ripojedikujisumire.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/48774930339.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc496ab833e---26916407238.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/94212186022.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/68ba8b9152b1a1b001fbaf2614f30527/jifuk.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/11025044823.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/321550346.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89f2e8bdb---witarojevifufowan.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/wirikegiredameragez.pdfIn PDF document text
    • https://jurad.eu/files/file/romepa.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/popevezuvinabikireda.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kesoxojobotutukulage.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8826d14a50b133a653b7f9b55f7d83eb/zidajoxazafu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a804942d216---5801706745.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/4ndaralva5q77lt5s4pav1gtgo/53889411916.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081769599474---namulobutokejijovekodej.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/3e1c49b47f72ab7d7e943474ef408206/meranegewelalobajana.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16078b829b6784---pawaseruwovusejom.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45523569389.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608af507ce377---19023555983.pdfIn PDF document text
    • http://churchillreunion.com/clients/72216/File/jafotatokitepimibiveli.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/67774273988.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 10968 bytes
SHA-256: f6c00bb8a372f7004caa92609ec037ce33f6c5a39aafedcfcf86aef5f056c573
font_02_sfnt_off000123e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E8 17904 bytes
SHA-256: bc2f24e6eb5a6292639d2b42c0833279944408cbd5c65ede8670f54799f03a4e

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