Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e79289a8d4482f1…

MALICIOUS

PDF

87.2 KB Created: 2021-06-30 02:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 18d650560406e3b963484e06eef855d4 SHA-1: e4694624afa6ecff5fc7fe96ebc6d0be367c72c6 SHA-256: 3e79289a8d4482f1fdb80462b84b861ae45de3bbe81aba664011805d914e719b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures to trick users into visiting malicious domains, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=definition+of+terms+in+english PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2t4cqnh70jkaoj94jolcnj8g0g/64872717030.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ed3c0ab0---81538625834.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dcb3e1175---getadoronute.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8fde3c17402608f04484f216ae227c92/1516501031.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2e8jfcqqe5i5nn2ie8cc4e8gt2/66803077887.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/zesaburukudegi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e295e7735---48796724972.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96e75e7a2d4239bccdcf2b9e0b015202/74038051630.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/77760246843.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ababe78c894---39376459223.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/rebaxagadesokewegon.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6018ed8c---33364005033.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/19362901436.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xerosedasilawoxuxofape.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ac263b94---rabulunuvifudaveliwoz.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/516767188.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf149b396c6---defarakukirosazebomakane.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/ritopobuvujemi.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/17698fe96f626d335bb386581e7d5d24/72033863260.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/koxabilinu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97d329333---fawinisazaxumizep.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8f3e6b38e95c4c1e1547921c036ad31d/vafoxewurisuwuxiz.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083670ce9f35---lolufakepizuparopusifoxon.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_off0000f41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41E 16836 bytes
SHA-256: a7fd5dea41ceca8db88c8bb6e45f64494e812550a0ea12f40f9919a1bd3511b0
font_01_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 10500 bytes
SHA-256: df361fbc28b2fc0b612f000e04f8622cc0b8b767545eda284cf98b4e6be57287
font_02_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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