Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a684bcc61029c0d…

MALICIOUS

PDF

107.3 KB Created: 2021-08-12 08:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 118a0b53ce0f71d3563ee88552c6a5c7 SHA-1: c2495c899b7bf0bd5c10ad8cf98175110ff2ec19 SHA-256: 1a684bcc61029c0d8a339cccf2255ff389887fb32229c4971eea2beee18dcea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850c47c68a9---suzorotokibaniripez.pdf In PDF document text
    • http://villabrown.it/userfiles/files/39439483682.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2a995f34c1007a00ee2b5c7596439ac/nunajikorevegikifokoxuk.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0b2047788e50f4fc75e4b83848077e33/xilevikuforujin.pdfIn PDF document text
    • http://freewest.at/punikomoboxatow.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/sosefamixirokolevivoxol.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/202a28dacdfae7f617bffc211d626dab/43416624957.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210622_225309.pdfIn PDF document text
    • http://status.cz/UserFiles/File/65702882191.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/c31a23946bfb36caa5e4c456bc85a010/72843045921.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/e5182e820077298b5de18965008ecf6b/21754577223.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rhu1a9d51651f09406j05j58au/57537669173.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98291b718---93060152372.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/nobipopexeboboto.pdfIn PDF document text
    • http://robbes.nl/media/files/fijumibike.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/pobop.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2a3ceffca8088137e656e637da4a18cc/58993264340.pdfIn PDF document text
    • http://agrion.org/upload/fichier/73395380347.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vtuv647so4rombfh8omkt28jh7/29298929800.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/lepipipekub.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/redokevubufozotu.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/45131337133.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kaxebazezadazop.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/jalewimiwobowosuxarasafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gamefowl+conditioning+methodPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF5 19476 bytes
SHA-256: 4ca23beb1843c3b068962364973db1aceb96ea87cc8ff3696ee325adef257095
font_01_sfnt_off00016e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000186ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AB 10780 bytes
SHA-256: 76b47570f7258a0a55a2b2cc1625aee9163791f6da70b1ace7c37c255a1a589c