Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f6e5b0f1ee2e79…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 21:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b0679b8c92d803a03b5f2dbfce3f6c5 SHA-1: 67469b5e2896f4188d49c1f021e9dad88e057c13 SHA-256: b6f6e5b0f1ee2e7938dd57aa4274585a342b217562244b4fd990e0df305aa1c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to compromised websites, likely to host further malicious content or phishing pages. The presence of embedded URLs and the link farm structure strongly suggest an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://twxcd.com/img-aim/files/jijenodagoxotus.pdf In PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/inrk840rg49k38396dnhafahu2/7466113931.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/79740049852.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/19504562487.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/xupupuvunilexuve.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e222c0ca2bc---wewozazaxezesatunadog.pdfIn PDF document text
    • http://liyangah.com/Upload/file/3795029523.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2cacc4e1ae7da6d5b7baa91681b12063/natemoduvevibasusegusi.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dukupezegofemut.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c93ca81a054---jenujidomubadozifogabu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/72563641024.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pevurexelo.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/48414233540.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/64812640600.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077501521cf9---navipilasatelumikuzi.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ec98cf4b2d3---bosejodezepulad.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/tataxoma.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457afdce4f---78668573152.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/90455182569.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/95786945584.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f2c5436172c5a822bbc9f4738d4ff35a/pavowepej.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/98768107027.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/95545639430.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=testmax+nutrition+pdf+downloadPDF 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_off0000b4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 10908 bytes
SHA-256: 4ef7b17c768da5c3df4caf9f5ea1db02d8e533162c6f31cd4637b9fb49318e9d
font_02_sfnt_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 15408 bytes
SHA-256: 6521afcda0c0e8867a7edc73a87fea724033a4eaa3712e32e11a201f90af14e9