Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea72e3c35240056c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 12:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 103221b1be8bbb2afac3ba79272261d4 SHA-1: 6084359adeed80d73d3f129f3033b359ddabab61 SHA-256: ea72e3c35240056ca39586df6e2691b5660c7b8e23b4ac49ec4696223fa88924
176 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised CMS uploads. These elements suggest the document's primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://harkakotony.hu/UserFiles/file/55793857810.pdf In PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/zutaxuluwowejonudopi.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/57085097304.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/357138e4780f67b224a035fdc1353181/morizoreverog.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/tamegumifizonosepomuxewe.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/79041229194.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a128f8caa88---61828767096.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612385f342e43---jofewanulijaf.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba39f1d41---mosafevirevaraw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db5bf0e90a---52846303660.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8dc5103---75203559653.pdfIn PDF document text
    • https://armenia4d.com/contents//files/95975543324.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b75ee84916a3a5240b85a71095eec43f/xugatumugimabifabipiro.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/musakunavizewuxixumusezag.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/872d4092674e4102056391ebee4561fe/woxemanubikokugonu.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zenoruxotera.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/kifafawagarotasorinobetu.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/45003113755.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/1552457620.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/35592282550.pdfIn PDF document text
    • http://promador.pl/userfiles/file/82746103005.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/78907029761.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xarozifewomufo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/87672127842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=applied+psychology+in+human+resource+management+cascio+pdfPDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 11260 bytes
SHA-256: d6fe3c02996419f60084b19a0de68fbf58a0ba262ba5a62410ecdaf6c664864a
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B74 15916 bytes
SHA-256: 077e299d9e43fc95c7e0d58e5e31f775931847c7a349b46f5e9302b5b15df941

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