Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fb7850c241e4032…

MALICIOUS

PDF

91.0 KB Created: 2021-07-07 21:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1c502e5a3a02e339743912f7d0998a7 SHA-1: e5495cc0514feacdde218f3aa155ccf91a7e2d15 SHA-256: 7fb7850c241e40322179771b9d3e99cc3bfaafb4325d84489e5a9b5003e07a6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://belgium-ex.com/images/blog//file/52616016390.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160732bb36f36a---kovag.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56d0494f6---dajugagopodaviwifuv.pdf
    • http://docando.es/js/ckfinder/userfiles/files/sakabixiwerotedatizazux.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7664csc8gndc62f76iu1cgpj21/kojasekosefosevuzim.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608087e8005f8---nekox.pdf
    • https://batikatravels.com/userfiles/file/26706517952.pdf
    • http://www.allatpatikapecs.hu/images/file/61964724126.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ple6ocm2kgtp521ouvhcmbk98c/garobikifibipa.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082f3f3c7900---puzodu.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc00cb316---gelisoleliritavabokun.pdf
    • http://dblbtech.com/userfiles/file/98473454659.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962598e8c3e---gudazupujef.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/42187331952.pdf
    • http://aite-materials.com/upfiles/file/varimalejanaxepanaro.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sgqnnp93hisen9cifp7fri10ev/93870311451.pdf
    • http://odpadykj.cz/UserFiles/File/jubojorulujikofefube.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/55f839f960d866e7903d7f9b50846721/buwemidorikavezaludijov.pdf
    • http://humanlitech.com/files/files/17156900765.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c19cdb36---12431552022.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/kukomikepojipiduzide.pdf
    • http://alexhofford.com/temp/files/file/38452688811.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c27d15e588901140e6c937419fff7427/tesorolifokoz.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609422944faa1---47668346651.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=weed+and+feed+mowing
    • 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_off000101a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 16792 bytes
font_01_sfnt_off000119b9.bin
80a730be6b225dd11a28692272cff0544ccb4d924643695f7e2f64d94cde74ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x119B9 10364 bytes
font_02_sfnt_off000130ed.bin
8ecdfc70a9841051098f24e9f9b74cc09e78b84723f6b9be76b9cb93e91afdb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 17604 bytes