Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f8d778d5633651…

MALICIOUS

PDF

71.7 KB Created: 2021-08-29 09:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2efc37ddde3f7bcfdca3ef77fc625b46 SHA-1: 0fec1e84ec5c520b20e5ad992f98086ec637741c SHA-256: 30f8d778d563365129993b7954b42ccded004709f28adab05736a933a9b8124d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://allytemp.ru/uplcv?utm_term=korean+currency+in+indian+rupees PDF link annotation
    • https://wsbtitan.com/images/file/88801967186.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/44419410485.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0a6eff57fcdf17af1db4a2dc367a23e0/24880939144.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/budijojuwebisaw.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/kovujose.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/16477787145.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3ea3a7933b2fa7dc25525b8447323469/zafolagup.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/78775620520.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/bhj8rrqhr4830j86c439a30vg5/62489034585.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/2868167721.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/xomaku.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/75201558781.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8e93d83b2---90494289571.pdfIn PDF document text
    • https://icbacademy.com/upload/files/nanimajolomekul.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/oc3q54b15va236vgbn4tqf8s65/3831585726.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jedanuxovemaz.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/48708833066.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/42e607a6a5f8da01e8d3615205d6724b/lejujuvofeluvesexa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf6e43ece---powagebedosokemupisarewul.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bdd3054b9185aeb62f5fb16335227723/45467608110.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/77684612755.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_off0000b7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E1 15860 bytes
SHA-256: ccbc0783ee745c918de557886cf9f9f6b64ca8432481e5365b8fa9a3a20811f5
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 10568 bytes
SHA-256: 6544458220864b0039656497f19646833e5379b65691b0ee05bbd9e42507d0a8
font_02_sfnt_off0000f854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1