Malicious PDF — malware analysis report

Static analysis result for SHA-256 3745286faaca0974…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 11:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e83140c4072d19e981889d2397fb351c SHA-1: a222b6f9fb300ef2a7c6cf317922db322b3951f8 SHA-256: 3745286faaca09741d69c6df5798544b74274b5705f915a836b9f5d07cdb21b6
156 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The embedded URLs suggest a phishing or SEO manipulation tactic, aiming to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://hainutedecopii.eu/ckfinder/userfiles/files/meroduzikeligajizimuvabad.pdf In PDF document text
    • http://galettedesrois.eu/userfiles/file/49730026177.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/7674855100.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/90178768040.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/sodulisovexaxumobuvozugag.pdfIn PDF document text
    • http://qdjshg.com/files/file/godewisoberu.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/bajegafarodali.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/93069226286.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tag4f4rki5nu7is23nknh3c04f/nivopiniluzekuzinafuren.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/73219248358.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/41066379667.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140bbe16f7c6---voropudi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/43a01c6d35c74a53f289ea6fd6fca28c/sijiwaxolomade.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c5ac3fc8---bisarew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614280f5276b4---14480579898.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/bezusoxefo.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/47980027296.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/gudupi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/sozobokuleluzoni.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7ae3c6025---mekuxopujogutavivaf.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/tamevebog.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/reneniz.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/711d52c0aa07a0fff8b75e4dc689d98f/85605982405.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/18938779812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+open+app+hider+without+passwordPDF 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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 10620 bytes
SHA-256: a77045b363e6263aa34149b57d5ee1aa4ffb497cffe4c0b8113783b289344c39
font_01_sfnt_off0000cce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 17264 bytes
SHA-256: a4c777c869168e2001a4c688c795e4af358e9c4d71aeba7dfd2cde32b4823ea9