Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a1c113ba529d58…

MALICIOUS

PDF

84.5 KB Created: 2021-06-26 03:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dec7a7da7ea2ded85a0e6fb1206967c3 SHA-1: 4c6910e9b128a04bbcf26dd4dc4e422a50090b05 SHA-256: 69a1c113ba529d583e0e1141f9d759fa90ff22c540c2d3b0dd53e5adfa2ae968
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URIs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=ielts+reading+material+2020 PDF link annotation
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4b2b5rh937noe4mdtb4arkfd5h/54349122749.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ea904c420c8a13dbd7f0878d2c5f8404/modevoborogoviziti.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/sg2kfa30rfdrs0fdfe5td5lqm6/7491850207.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8651f82cdc19db016d4d2c8d1607df9b/85222000546.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/11860855276.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6d09887eb919add2e2d5d17f2613af4/wavix.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/96761540960.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/48542736933.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bf97eaf28e3---15524537572.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607604ac3729d---kenajadegil.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e9e18f58688560f37aa47594138702c4/rawev.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608767fe0d8c6---22647002411.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ff622a09c53c15248b9c047b34948d14/37880758460.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606efef14e4d8---jimawoditusus.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/99053572846.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/tf8gaqo6l43lg96r496ep34erb/dodupajezevopituxusuk.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6510221b8008e78ae32ccaf7da127c9d/sovobutepodevox.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/75af4e9f273fb3b682771f4db9e82733/likedafurilamazuje.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16098cba02f67a---53820497889.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/liwagon.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c0670a79fe2---8780084680.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607587e0c5910---totapafutovoraver.pdfPDF link annotation
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/46c160b1bee4374e6fa5637b42727e5e/putokave.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_off0000e88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88B 10664 bytes
SHA-256: bd89975bb521d6e207cbfe8966f1836194116dddfb042a7e391a70a5860f2d5f
font_01_sfnt_off000100c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C8 16900 bytes
SHA-256: 1c5770d3265906c78edd5063349d6c5296bc69a3f9c7d716f3ea75f13e6fd7a0
font_02_sfnt_off00012c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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