Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ae3b4d53f3ad5b…

MALICIOUS

PDF

89.6 KB Created: 2021-08-07 01:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2581c917b9f20245f51db1c459dd5563 SHA-1: 0f542faee388788c4f1976badba863d90327b3fa SHA-256: 08ae3b4d53f3ad5b4545c84176b14b6d4ba52a7143a02908e48c1f32b08b211b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its purpose beyond its structure.

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 https://argekaucuk.com/nbg/upload/files/narukumibizoparevizog.pdf In PDF document text
    • http://www.halpellet.hu/userfiles/files/16662649751.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/bumuvolop.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/91bda50693af425333893c30c79ef44d/36921413163.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6ca0db19---repowape.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/504e7178230bbfcaaba319984a57078f/2940147287.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0c036e8752cbeec1646cfd05ccd11f5f/ribavabawasegidek.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/16u1hn6pr5pldif060534r01h5/46876059442.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b6689181---6399052305.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b1da9e8f---ruwezosogefar.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608179a540321---43323334769.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/50729903657.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcfc9c711---vufuse.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/60934865930.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vubijoxopijix.pdfIn PDF document text
    • https://masihpt1.com/contents//files/2809744148.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e9d021b39d4e4a3bf2e1523ab812ac61/29153467323.pdfIn PDF document text
    • http://prosquash.by/data/38997033280.pdfIn PDF document text
    • http://riversedgefm.com/files/file/32683017536.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jq35p8advenn1t4sj2j9od8bug/tozodusutevana.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d562ca39---52617201919.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608117841fb80---43847677552.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///7395052264.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=minoxidil+como+usar+no+cabelo+masculinoPDF 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_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 19488 bytes
SHA-256: f6d44d18f183b58f03b5d1fe3bee3bcdb19c9f6d4302e00c7d7a390f5e812abf
font_02_sfnt_off00013e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E41 10768 bytes
SHA-256: 9f7570aefc54a7164cbab3ff23f4169f0d432501e06493059da1e096b5f32644