Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af5bbecaa8858b0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-05 12:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c259c0e036263b0302c573bc4225050e SHA-1: d030623a933140ced1037840ca5016f9abe80c44 SHA-256: 9af5bbecaa8858b01caa21099830471c73489706e90025867df087de2bc355dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=b+arch+question+paper+2018+pdf+with+answers PDF link annotation
    • http://metafelix.it/userfiles/files/95385078731.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8beea3ad7359b6d39808175d31fcc933/21089699383.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/gufowuzaxi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bnv3cu790ah2lq2hkavlm7mav0/26571836512.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc04309c62e---60554369075.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/88826502204.pdfIn PDF document text
    • http://finchamauto.com/pics/70092708378.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b19079f---53963959085.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e3423a49---gatogi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/22143030751.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/34984625725.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vaxipatebotofogilije.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/kuwazi.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/39848287705.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/684c823a4c48c07b6a72fa5200bb0bf6/20468056015.pdfIn PDF document text
    • http://sql110.com/pic/filipu.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47902014470.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/52815161232.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dd26a23287b3ad6a292310228760bd1f/95009276780.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/13414512101.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126767ba7b93---2420079265.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/41ee67d1afeaa4be9f194cf0fce25896/mupilikotitekabexu.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/tuvipezaveluxoxeg.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7af91b8c3fb323e565874b4d1bf9e372/78286280603.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/podagezidosonuzavujixof.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_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 11556 bytes
SHA-256: 46a74dd1f4899207e17bb2022229de8683aef14fa3ad01ad0df45b06be7eaffe
font_01_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10797 17116 bytes
SHA-256: f96e897a45502111e7b12ac37c5e8a091e03a72e0d338daca0bdc6ed6cfa52bd

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