Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff853d7d35c0af0f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 12:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ddbc2f5a4cae963c0eb0fa5a5be6a60a SHA-1: d3180309c325f2118c5e7523bfa7b8f2950555d4 SHA-256: ff853d7d35c0af0fd702fe22c3c11cdc75c501904f270c9ff41a38ad36ec0a4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=how+to+jailbreak+iphone+xr+without+computer
    • http://reelproductionshd.com/userfiles/file/66753386889.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437948de517---wulodarepoxitejolomeke.pdf
    • http://confidenzacsapagy.hu/upload/91254525089.pdf
    • https://noelex22.org/userfiles/file/3378755727.pdf
    • http://palami.by/images/file/ridesunodalavaja.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/gidufo.pdf
    • http://fantacyhandicraft.com/userfiles/file/bojujilanuvugupiruguf.pdf
    • https://geneticapanama.com/userfiles/file/ninule.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/44869364615.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/55bcf9f2369ef82e2e7523da9025a636/24944241921.pdf
    • https://dichvuhappyhouse.com/upload/files/lafugisojejen.pdf
    • http://koryosushi.com/uploads/files/bemodawewaxezonizi.pdf
    • http://abwrva.com/uploads/files/mibuzunobik.pdf
    • http://fitviewer.de/files/file/vununosusoxunodudogu.pdf
    • http://exosportsante.fr/ckfinder/userfiles/files/35229830308.pdf
    • http://fkhd.cz/data/img/54022019976.pdf
    • http://azizolace.cz/images/file/xebizu.pdf
    • http://roberlo.cz/www/files/file/zobotafebo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3eb42ced5744740f747dfc15dc4a849/lomunow.pdf
    • http://podarox.ru/public/files/98161094806.pdf
    • http://mascotdd.com/file_media/file_image/file/jutuzan.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2eb95dfedc4db331658684ca2f2f9753/pelirufemizunewujajutolo.pdf
    • http://asiavent.com/UserFiles/file///zirati.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161331e5595991---93685527387.pdf
    • http://mgrima.com/files/file/9524793980.pdf
    • http://k2plusinterior.com/userfiles/66990521294.pdf
    • 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_off0000ec4a.bin
f27e4bbfa7889b5f987179c8292bf9a25a1b8b33de71dec8057444ca9fd3767a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 17788 bytes
font_01_sfnt_off00011ace.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 16792 bytes
font_02_sfnt_off000132e5.bin
26bdc2e582c277c9dfaba01b7b6b26e4d57f796ae324959a3807c3545daae2e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x132E5 11112 bytes