Malicious PDF — malware analysis report

Static analysis result for SHA-256 507c5f48da4b68b6…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 21:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ad8b1404aee594972731a0d0d1df653b SHA-1: 61c5f480cd9921c766d6b5dc7ae3724503afd618 SHA-256: 507c5f48da4b68b6f57de4d83d3d56257540583d7869172af18059b950d10536
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_CALLBACK_LURE heuristics further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=best+live+stream+sites+sports PDF link annotation
    • https://mariellatriolo.it/public/file/tufuvu.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vogulexaminojena.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/2862292108.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/83356298669.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f3b851450fc75f99b2fec627582fd812/gusabizarosuvomu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137437f7451f---30836756271.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/biletasuvarunuzagumotu.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/sogofaj.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tfdkcmrsoeuthnv500ipc9ij0/99368636658.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090413153716.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/zenatedisetijexamidadera.pdfIn PDF document text
    • http://3asoft.vn/img/files/kidomor.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/74303863336.pdfIn PDF document text
    • http://teplospectr.ru/images/files/60216175202.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210910_151448_178.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/bezajatij.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/27163244545.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/dubozigedimajamowimotebem.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/55422924667.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/kepavusuto.pdfIn PDF document text
    • https://salwangurugram.com/files/mujopututexujorirepubi.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/lafixuxubopufuwigapumomo.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/27693648970.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7132648516.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 10428 bytes
SHA-256: fa533373f1cea79a10ca0c21df8b21257f88e07458ee6190c8b56834d1499fa5
font_02_sfnt_off00010bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 17624 bytes
SHA-256: 60a3f30cc02bfbee85bd12eb116ab73d790133f7eebb4907f3fdaf2810c2222c

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