Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1c4cd944daa711…

MALICIOUS

PDF

94.0 KB Created: 2021-06-26 03:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4c7811ef933f4915b4447b49149e1a9 SHA-1: a65b75804e5f35aed58fbaac67c9af98706ea386 SHA-256: 2c1c4cd944daa7119e37474af6194eecee3306756419cfeb4b68af04d26e6480
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize WordPress plugin vulnerabilities for file uploads. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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=template+for+retrospective+meeting
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/049189c94ed0b1f0d3e6b8099cb48e2d/11262151647.pdf
    • http://cosmickino.ru/sadm_files/72559601667.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3625681ea---fewaxoriwe.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52f88982d---81745556411.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b53f554---11087934091.pdf
    • https://cambodiadriverservice.com/userfiles/file/xelutidexoko.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e497cd014---22597432455.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16088190e8f4e0---45247491780.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095496f4c810---seduf.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/2pntb88fbh861ashs4jc6uhe40/21767232090.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bp3fe9v4fd5ato2aq166e5fhsg/66603512310.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/68b2e26c22e6f21b0cc6258a04ae0b0b/bebozavisaw.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7tr0j3imajjv1lgkbud5ufidhq/wudotuzutivazegu.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071a54e06d8a---48440424387.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93bd9f5d3---siwifaku.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/kgl5bje1b1dgacehoj7o1v34r7/44496312675.pdf
    • http://www.zywawiara.pl/pliki/54735267488.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805007ee4a8---lapegemidixuxixukata.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/84fd18e71351f9ff74a78375696cc3bb/jumogusodofudabot.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae03bb31b15---wekudifanulasix.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/8d43900739cd2ccb0bbae44c5d219a9d/koganoxujipigoguxinalawif.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/8a15c8209fa03ba085ae99fc9f6ba38e/vunejobuvefogebunujaviv.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ac17d0799---mudatozusidewanagilozate.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/al3a80loqj3i0bh1p60a6sioj9/lulilapedoviraruduzamomob.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_off00010e70.bin
602e21c8a2b52707bd40ef1fc6abbfc10d918e825a3e0ce5ad33a85e1bec2213
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 16640 bytes
font_01_sfnt_off00013976.bin
8da2e73669b17825db165d8b55b095f68648137e80554707d87b1f69987ad0b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 10852 bytes
font_02_sfnt_off0001528e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1528E 16792 bytes