Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c77395e07e6586…

MALICIOUS

PDF

82.4 KB Created: 2021-08-18 17:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a683bed3a1e9d3422a616f198b92be4c SHA-1: d9c157d991989ffd68dfb0c2be4c4b754040b6a9 SHA-256: b7c77395e07e6586d482bd81140a2539fb19da412611b9266c48463275f7fddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to exploit users through deceptive links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=sound+forge+6.0e+serial+number PDF link annotation
    • http://interel-rus.ru/test/sites/default/files/file/sirepubewugadiji.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ce9fe5ebdb7792298752a1bc905df89c/88765077965.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/lri89h62lnk0thtn9n9d532sb4/23754209404.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a524d0d8f21---bebowa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210621042227287436aelc4l.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/paxekogilamibika.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/29458594554.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/06omc6lg6sit2stmbcg8dekql4/52992936677.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/xonikore.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb9a6051b8c66aaa3ff96d8819addb2/28810065967.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626492cc34---69496978266.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/8fpqpvt5os2p8euj2didrkmv0d/rewijoposivuzufufamaxes.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/33677842242.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210812053044.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2abd815a---jitesijolalupi.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/41012ac4602501fd025a373dcaeda25e/81516443267.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f524fb10c4---wawegesowonapuno.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/60dc1303c5b3c.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/98527270797.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/65214577380.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607030a69a99c---litiromepiregovosurexu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/b699a6454a7a87a5828d40c57a6ab169/pedifesenekisikedatar.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kurimesopewabov.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_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 11272 bytes
SHA-256: 4ff2c7652a5db8371dd8b8ef1216255852d4612fac5993af974fa5d6e1beecea
font_01_sfnt_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 16472 bytes
SHA-256: ffad91d706efbaa0e06972c45303d7df4d549b44dc38c901c9af709d5e84a8d9
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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