Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6495d4fd5dd9db9…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 05:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edfa47a24da183e5a1eb9218f83e64cc SHA-1: 5ff90d2523a4af879af17309008d4088544eb0d5 SHA-256: a6495d4fd5dd9db9e2a7bb579a59614463fc45f06dd4437306e0da3dd2257983
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=justin+bieber+red+eye+ft+troyboi PDF link annotation
    • http://rungruangsteel.com/public/upload/userfiles/files/perupivet.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/gozibipalidobazow.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/81015817901.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/xuxilaj.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/jogamosusele.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/ditaki.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fac68813de6c0957404af4744f573d99/37329148229.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/41979097921.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109091203004135.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/21022787639.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/tojezeniveno.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/92808079751.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/benazin.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/2989638503.pdfIn PDF document text
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/63467269280.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/tozotunakugawidum.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-07/210907001743079539pbbvrrkpowns.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/54776150682.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613550264086d---baluluvuxovonevexujep.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/jasifepupogedaneguwu.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/nifujedafivikusefega.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45320316411.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a114034548---90488708500.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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 18928 bytes
SHA-256: 51c3332857d11a36e33064510686c6fb42c2dbfed6231a53d7491634c02d8902
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 10484 bytes
SHA-256: e41e873ad306fdcad86003f077c775b43d6466b8857d152f2d81bdec686bd4c6

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