Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bb4b096b34e5ba…

MALICIOUS

PDF

72.7 KB Created: 2021-11-12 11:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 742cecb555d37b17612b8715420e654f SHA-1: 323e11f227a38c081301e628d72960c3a964a9c6 SHA-256: d6bb4b096b34e5ba272b633f89718602c52ac0a9fbd0eb492e7e5078da686ed5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This suggests an attempt to lure users to malicious content or potentially exploit them through chained redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://k2plusinterior.com/userfiles/mizuwerizepexa.pdf In PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/10/202110011107568628.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/nososizituzesa.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/25874467738.pdfIn PDF document text
    • http://nfc.soo.jp/file/lodamojesu.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/58820611179.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/gotobetojomasufajudunu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c6567d113e9ecd38c384b5170d2fbee2/73901541697.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85264043989.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618c08ba02be7---37427640772.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/39566429853.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/jowajesemenebedonuse.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/47310916951.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/81720750538.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/dexanozitebamomud.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/nixafinapetobijav.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/cf64b57a0ad857c4620b9d466c75e42f/wojujaluv.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/mugetixesozo.pdfIn PDF document text
    • http://newshop.jp/archive/file/2233610820.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1618dd69fc1543---kukimesebiwufebimul.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/mexafupopupawilawixaze.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/34896689526.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=physical+education+teacher+evaluation+commentsPDF 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_off0000ba7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7E 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 16392 bytes
SHA-256: eaf0c59d678988189d1efa3275214319ec17d40150a82a10f2b23e5d98f2f45f
font_02_sfnt_off0000fc05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC05 10916 bytes
SHA-256: 2e479925c96da9dd90975d5f66a2eeba441cb5a3e00f96a9b91071ebef4f6d2a