Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83c7faf4fe8441a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 17:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ac96b34797db9a8f862e237839e3259 SHA-1: de921de7fa3dbe1e75608f45bacb48beafcc7de3 SHA-256: c83c7faf4fe8441a0e58faf6389efebc1f5cc272457c3fc1b19281fbbcb55851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea596e4d5a---zudigosafunozebaxit.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-14/20210914014811520131.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/sidagajoxotugubadevivad.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gizigavomidasuduzosamuzu.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/zutupoxopifaxim.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/3572217766.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161372029bb7f2---gazetosodip.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/getepifemofizumagu.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/78094117919.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jigimo.pdfIn PDF document text
    • http://odumakus.com/uploads/files/rodafadage.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631740120.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/mapeximagafa.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dakapasija.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/51328254937.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/lejufusulelibeduran.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/revidivazavu.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/pozixepobumuvazoso.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/dawajinumedasapobunida.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/faziropewo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/xejulijivobukoxefad.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/nawenebizosewomelijirusip.pdfIn PDF document text
    • http://intersonik.eu/upload/files/fatatakulemakunomafafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=apk+hello+neighbor+alpha+4PDF link annotation
    • 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_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 10556 bytes
SHA-256: 0e19e9f1b11945e1e642401706d461316fdac40873a02f2533f17f509121c557
font_01_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 17268 bytes
SHA-256: 08d8d58384c2658c6987a95063cd3a4da40ccaa39b4a907f1e956835a147580e

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