Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c5d132a7c7466b…

MALICIOUS

PDF

87.9 KB Created: 2021-08-21 16:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8bb1b103b425f3eb5807987d58b3065 SHA-1: aae01ceecac806d88f42c2b0e62fafbb40d582a9 SHA-256: 76c5d132a7c7466b79f49fc9af95284c5c6853ae086c1c3ba5d3f63681c770a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, often with UTM parameters suggesting SEO manipulation for lures like 'gta 5 free download'. This pattern is consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gj8ianeq018kkltd7eaa1tfe1n/gamigobigonujeze.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c60b31beb9f---podomu.pdf
    • https://demircanticaret.com/userfiles/file/31612512262.pdf
    • https://vegan-eshop.cz/data/file/xonilijiwiwumozo.pdf
    • https://ferropula.hr/files/lumuvezebinefa.pdf
    • http://snsi.jp/image/news_file/timusabopipetiged.pdf
    • http://zkojicin.cz/userfiles/file/xaruzivanowavugadepowaz.pdf
    • https://vntdc.com/upload/fck/file/34419383674.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/sofinudibez.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j5qbqa77jei1qh70c5u5hufai6/20180042544.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/vejumojiba.pdf
    • https://eletvital.hu/uploads/files/mifidozite.pdf
    • http://frangarcia.eu/upload/file/78584457287.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b215286c78---visituravetorovikaduz.pdf
    • https://bititechnika.com/uploads/file/90060163384.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611a66c0790e2---39599643241.pdf
    • http://yepuco.com/uploads/files/dowemipetifix.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160960e62a4014---dupowijoxudukuvejoga.pdf
    • https://tl-systems.hu/files/files/72861196415.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bae58b9868f5ac46a7a2f35c506eb4db/dotepetometopewudumakodu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bf43e4a1bca---10754839509.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eca4618d820d4dd1562d9f0d7e92731d/3096057501.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+free+download+for+pc+offline+without+license+key
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
font_01_sfnt_off00010803.bin
07c19739392202558c784f98cb2ca0bab2dcad186a49fd3ef496758d68d9a202
pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 17616 bytes
font_02_sfnt_off0001365a.bin
38270005f7a4c2ab7025f195bdfe959a427fce4f40bfbd1bc7b4b0e6f1281f7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 11284 bytes