Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf172a0853db1244…

MALICIOUS

PDF

88.8 KB Created: 2021-07-02 10:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16dd6de40f2c8b99de23a23f9322eea9 SHA-1: 1e90b1d00a63efe931d271f897fdc36e3d9735c0 SHA-256: cf172a0853db12443913be9b666256f7d0673101ca610f77d23c7a76939f98cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for malicious content or phishing lures. The presence of external URIs and link farms suggests an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=willy+wonka+and+the+chocolate+factory+oompa+loompa+cast
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/433a5e46b7525c76eb83311710fec08e/tubimogizuvarunatezol.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab02f92c1e---33843136569.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ea642bdc---79728808679.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24874c010.pdf
    • http://2440027.ru/upload/file/94781014186.pdf
    • http://usagimatur.com/files/others/82257824179.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l6upodhvam74ropu3l0r2c5674/taramedojijisozovefaw.pdf
    • http://metalltechnik-kutschi.at/bapadu.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/s8s8cf0u78pef10sqdv9sjvb17/97196744060.pdf
    • http://csc-0898.com/userfiles/file/20210607171842_6t1dzg.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a089dcfce10b165098d4362cf76d6e66/zaxepinazagobujanalawuk.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/49193378603.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/6e0a50be9c2c1bcb6ff98a70851c34d5/22977345504.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b24e4040b62fe2842c7c4ac1897ef41e/19917700133.pdf
    • http://dtcguild.org/clients/80367/File/dorukesuta.pdf
    • https://bestcoloringpages.com/userfiles/file/masukixaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881fc64bf05---53141325827.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608af66651007---lulesokamujirilefez.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab39a5ec07---41101689904.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b21ce2c4b1---nigawegexeburumalan.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/sosuselaxulugogej.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608769bd01810---32902306603.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_off0000f0c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C6 16792 bytes
font_01_sfnt_off000108dd.bin
85a2009a4925436c1b061190b6a6f41131a99f3a882f7d8e51574efe4d6ab43d
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 11168 bytes
font_02_sfnt_off000122ce.bin
7999cb4df6ecaa5977620c2e7501bb90f7600639d7526dcb647410f24499bad6
pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 18708 bytes