Malicious PDF — malware analysis report

Static analysis result for SHA-256 9340f6d2b1073ad0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 15:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b72a2282d9fb7d7816864017ac6095b SHA-1: 9b0057383b011adf7a70b1e21f729eef17c88b2d SHA-256: 9340f6d2b1073ad05c19f64215757ee15ad846b9791de1cc41a6219a16faed89
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=code+of+canon+law+pdf PDF link annotation
    • http://luckdidea.com/ckfinder/images_store/files/tidokokaliwoxakazezigad.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/dipej.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608240506e35d---domitojabep.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/34100328537.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/bokexavemovibenawibo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/geribeworefubokadu.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/38638977784.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/20148008353.pdfIn PDF document text
    • http://01host.ru/userfiles/files/vatob.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/48461897301.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/mugimefuvuliwokavetifebo.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/44735981181.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28fc36047---30032965603.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/wivoxesu.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/1393556702.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/66789575783.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/12352206347.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/9911048406.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/mebenirobaroxaz.pdfIn PDF document text
    • http://medi-sen.com/files/files/98535962913.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/sebodiforexozozateveb.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/daxigikonulewufek.pdfIn PDF document text
    • https://geniodelweb.com/file/wokinojevekutuzutijodutav.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/94aa76f81b8a96d9d0355522a12296b2/93838319581.pdfIn PDF document text
    • 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_off0000d8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 17360 bytes
SHA-256: e7a3a72ecd02f87448628ed5a19016a65beb81713677e06d9377c6ff37d521a0
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 10272 bytes
SHA-256: 622a15218c8b5829cd0778b700b23f5e423b05af5072bc3f929ba104c347005c