Malicious PDF — malware analysis report

Static analysis result for SHA-256 f055a496a2a0f285…

MALICIOUS

PDF

82.3 KB Created: 2021-06-28 04:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4ad80d6c18dfff5c9c313731e8bc697b SHA-1: b659598a38ed3f971c4790bf83569580c15ca1d0 SHA-256: f055a496a2a0f28557db829b777b742ab071bb278e23ab191821d2737d796a0f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination or to track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://accesoriosalmayor.com/images/userfiles/file/98620680604.pdf In PDF document text
    • http://rund.cz/UserFiles/File/wuwizobimafegoja.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/52350549525.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cea61f28f6---lilutir.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/69277205876.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/g6fhihhvupa4a9cfcsrpev57qo/jifemomolowometinegod.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8cda49373ee554f4d122ac0354705df8/43478542880.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b95d45d152d---jupipo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/41g9sreivb4udmll85ti9c4r60/wupubixax.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/23430149588.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/wapoxozejif.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6a7bd96a80fe8231ad825203c8f9f43/bazaxapage.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/tepidewelixepobazewupidud.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/25961849589.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/87867324856.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/66291188642.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/sixuforupaxiwi.pdfIn PDF document text
    • http://liyangah.com/Upload/file/68955140858.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072897d124ae---kujiweb.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070382e0aa88---20330645300.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b7aa77a80621eebf400ddf3e9ce8501d/begodutajufokirux.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/imoh1g4kalsvi5alogu5ejm95j/xateturefasovoxodunaga.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1a9e5490---minesafetatuv.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb07cfb2d8f604140c0ddc80e144989d/titiwimajawafekexuzod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=is+eating+bread+good+for+youPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f5a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF5A0 18596 bytes
SHA-256: 63e1e833bb46cc3d655d10ddcbc6f6536014c1855295622c567f7d50f49c9917
font_00_sfnt_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 10788 bytes
SHA-256: 95be69b6c4262cce6fa2c7720c87698850d8afbcad1f411fd6bcb55475c83252
font_03_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 15384 bytes
SHA-256: 8d4b03195c35374e0635f4598a80896aed67849d85b1347a4c0c59b6a7542a2c

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