Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a28b653b293f758…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 13:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e11be48a063539684f7df3f656328d90 SHA-1: 239965989f81cbb359ff7b634501c82c5c00daf9 SHA-256: 5a28b653b293f7588795665d7dca5acd4a5fba592290baf7d78914576f8ac3b3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised websites or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://debnine.net/UserFiles/File/33185708735.pdf In PDF document text
    • http://versobrokers.eu/userfiles/files/92736798844.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/38252787754.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/62395448663.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/lanigovapu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161354607d968a---60732945526.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/kawoloziwozox.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/revemalurozexabebok.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/dodemedexugejew.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/6312960686.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/61136600592.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/vasegujadi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/01cf8c0932baac97dc9f9e9a33e0e5a5/balemufunusiloj.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5beee080fd37ec139f2cd3b7a5c4e000/zukidiwixora.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/35k21jnga43tc7vqmqttab25ns/neragolinijopejitenexoba.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/740483769.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/46747236742.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dmto0808f1bjoaene63b5q37v1/5420851129.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91428653050.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/xijat.pdfIn PDF document text
    • https://izometal.net/mm/file/14853281086.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed38f3e56a---28033840871.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenudukatozezutidazovar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=alarm+clock+app+for+androidPDF 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_off0000be07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE07 16716 bytes
SHA-256: 651728f8f3901e90645a047b1e8730d6218e2c490d5eb7cba6bb9e9c5241a0ba
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10456 bytes
SHA-256: 2eef4f8533f7afc3a3648d028b057d56228f3e7d68a95e643348482258585d1c
font_02_sfnt_off0001009a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.