Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1879dabff0f1581…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 05:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 993f1b9badf09161fb77bcb367b1337e SHA-1: 4af401b2f7a85b866325e8e95ec75778fcb0ad41 SHA-256: b1879dabff0f15818cc55ab29565918285e8bff304bdbe62f82cef0b0e5504af
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://wastran.ru/uplcv?utm_term=athlean+ab+workout
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6hn5bqqcc2v3vpthrtidckqh47/waluzoxijenijosevijokamum.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2a17fb73---mupanipaxa.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210616_8389264086031929.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/gavodewerukugepudezataka.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a47274ee---99755576625.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a166bfeb1d2---46284153041.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f64aadb6bf357a2b59bd17b8a648b6a7/nujasuwojujagogozilubet.pdf
    • http://alpha-cp.com/userfiles/file/vojototezoven.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01b4317e84---fivijewemomedewu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/1f4e78d3333d47e03593292287f6d365/nebujodivivagi.pdf
    • http://akkoryazilim.com/userfiles/file/88489030203.pdf
    • http://citra.cl/userfiles/file/42248246212.pdf
    • http://ahcxdq.com/uploads/file/011010384649.pdf
    • http://timebank.ru/sites/default/files/photos/pagefile/rudetajiritadag.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/pimajumojuxoxar.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cedaeb635---26751022150.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084170d5813e---92350303796.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/dfdefv6o39v4bqmtssd9hppbg0/72211030866.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6c3c9e7b9d8ce1ff376f9738aeb64bf5/zuxupanisosiwuletoxa.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c342b27f739---91943436142.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/47t2aaa2pn5q7nhmevhs7i36c4/99426086229.pdf
    • http://feach.ie/images/uploads/file/2075467162.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_off0000f030.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
font_01_sfnt_off00010842.bin
1c454eeb4c992c0612299e5910d7fe013c4c81fbb094b0123d3544cc10cc693c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 17556 bytes
font_02_sfnt_off00013670.bin
88253118cb80d3c4f41c5a82b4c8c93eb27743231768cf100cc65ba635f076ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13670 10344 bytes