Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc1cab7dcee193c…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 11:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 400f226ec58b53f8a0bd838561c655f7 SHA-1: 3ac742c5b69cb644a1290684755bb7fc6fb0deda SHA-256: 7cc1cab7dcee193c59d8c76303f935d01c9c477dde863679eaefb03eadd10c62
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to host malicious content or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://b2cexpressdemo.com/userfiles/file/janusozole.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/hgt8hhnbt8g649f2qbl9s8i8f6/46110666400.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075959b5563e---39951042512.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/17f436222ffe2091b2a260fe179812ea/28138539415.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160837420904c4---kebugawu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c699aa1e90c1eb17f113e45ab6b469f8/paravuditifonabebobisi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5c13191c---remekoz.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ltjfugss8al3b2b1un3pg4ifq2/rutiwi.pdfIn PDF document text
    • https://tavio.ru/files/file/31145643014.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/90287723238.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f94b616f---90338871413.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78b4a4593---2374774509.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pbjbs68ojpclri6tqbi1vj86u/91618497911.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b0c63fc66---kozibebasivu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85259d0c2---wosixuxuxokukogesuxix.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xusedezoxero.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2ba619b6d---67796085298.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zewadojawodapu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/vugixogesit.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/zerenekokipojelisiwofupu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810a43e2b85---zopadufavinonike.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d90fcda5a06---17148457382.pdfIn PDF document text
    • http://quinta.cl/upload/files/gizalelatekifamerowiwa.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/xunatamizi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43d6c1f2e2---kewowixusubulumebutuwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=different+communication+networksPDF 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_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 17080 bytes
SHA-256: 269a96678d2b37ad00eecc7cc3e46cdf125c393007841413274f38b894f9069a
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE4 10728 bytes
SHA-256: beaa8a4291abf5d16e9ceb72f363bda86918696e8519dc71a73acb2f029aa35b

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