Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b495b80e26d0666…

MALICIOUS

PDF

89.9 KB Created: 2021-08-30 01:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b5e537848da6eab5f7b932c4d6f2081 SHA-1: b2e04d836e0097c3261a96e0e33b8403f3beaa38 SHA-256: 4b495b80e26d06662e1f1637b6998f379da2bc56d3b6eb1943c47f115364d58a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

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://aadhaarretail.com/administrator/imagetemp/file/77470366146.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/266v3iq95lov80lp0nvvekvld1/welapadifaku.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607396360a501---biwogufesugalaretevuxesa.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/xigonif.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084303520219---77654810032.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b93956fce8---mukaselinesubola.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6c5073933---86324423910.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/79035393580.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/jenuw.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6287a15aac---wipobapadatogo.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/jagopigezizudanoma.pdfIn PDF document text
    • https://flyags.com/editorResources/file///72274534362.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/84507452137.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/50750917055.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b54f63d6713e91a804d46fc994bb7ae4/36952291597.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/ziribodonewisimumiw.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/11347531353.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/87314827032.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/gutubibodajometisis.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/5p8vgojc1iuifsu4een5g3pkst/92863100777.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec52c429024---30294307776.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/fowumadanagubovebag.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7efb3ae445---76860737565.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/pk2td3muafkuh7rlk06isdge5t/jesuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+chemical+equationsPDF 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_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 10812 bytes
SHA-256: 5b768dc4c4955cf8060352f9fc9ad51b9fedb344857beb875bc0fb7cb001d8bd
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 23896 bytes
SHA-256: 15ec5d678bb0d86e8752ea768d98cee13410f915ebc91ad18da323e69e4a075f
font_02_sfnt_off000141b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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