Malicious PDF — malware analysis report

Static analysis result for SHA-256 88af2b2233206b14…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 22:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44a69c8c051fbd9b6b209bd63ca887e6 SHA-1: e5fa4a0d058b87eb77a0608096eadb8788cce809 SHA-256: 88af2b2233206b14a0e750bba19294e0696c741a4fa18c0d0843719ac3a107cd
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs that form a link farm, pointing to various disposable domains and compromised CMS upload storage. The primary function appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.neoneofitou.com/ckfinder/userfiles/files/jisapusewubumigolalowoj.pdf In PDF document text
    • http://cesvil.it/filesUploads/file/zufuwuxaxopexanajukeruv.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/wawinadanizewidozevazu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/74482722366.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/tosaratuwa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614f731ca2c50---marobuduza.pdfIn PDF document text
    • http://ipceurope.be/assets/file/posoweboben.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f21941bc84---xezinodatulepuzofupilod.pdfIn PDF document text
    • https://kimcert.net/E/file/68522349793.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/nizitilunexekakesifefugax.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • https://cargobull.cz/res/file/53211430520.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/33956745509.pdfIn PDF document text
    • http://thefencedocumentary.ca/adminfiles/file/ludek.pdfIn PDF document text
    • http://word.mn/uploads/assets/rozoketonimuvu.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/wazewipufur.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8e24ea7befea3a47c14ca6638fdf4d35/nataliwifibi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/jimcre53lbht29pc8so386h2e1/13557654336.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/befej.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/suzixalivunegiwilenojazix.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23546707012.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/xekebowilaxobu.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/67611266352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=niv+ewb+free+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_off0000b059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC870 10348 bytes
SHA-256: ed03f479571cb9018618b5b23f0159bf5f1366f5968007a0a7c360eae92122d9
font_02_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 17292 bytes
SHA-256: d3bbfccbadf0e50f083ce33ac505bf352b691e7c6f635c00c32ab42ce7aed263