Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99117451111a7af…

MALICIOUS

PDF

109.4 KB Created: 2021-06-27 20:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60c0e7740b2a080bc68b9266f92d9435 SHA-1: 791ac1a5743c8cb9608266ee20253d6978a5ce33 SHA-256: b99117451111a7afb2697e36f839ab3c62bb65d5838ead11dffa6948dc6c52e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://qytbearing.com/upfile/file/daronejibeduv.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763037ed60f---bigaxebakukatagapixop.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/zibogizaponapubileja.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29bb9544b0---pisaw.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/vimekefigiw.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76f00b0f4427b1b3996f3c00d76da3f4/duwijiwaxodesomiwesiwik.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b449349e03f---3462294541.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/tofigetipumoz.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7aaf26ad0389b70257da67d4c20fe0ab/99696928444.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/0b44ba8c16a6abb52294b04efc05415e/banujetavewuma.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/f04i3nshdfhbpvs4ij1pqiipb1/81936008865.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/61990806139.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0730733780---sakubamelofenutesevoluga.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/zibixafepovinaxogi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ofa7u77vfhecu3hejjudttfib6/29193243891.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac191b436e---vafatanixufitemi.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/badubomubuzukifumuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b4e4b5dee---vodunobiravubax.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a17f4c3d157309b44659753d0470a7c2/vuxutemijemogixaruxus.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/88719027022.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5397e323ce---sizimurilujo.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099858ce1eb7---gevaxexozizilefogogajafe.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/737fb0a8c0eca8f6fd3d2ddffbeb969e/dezuf.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b9ed63ba---22678894690.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be0190902fa---30084437120.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/28994890879.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/95765598224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=alphabetical+order+to+the+third+letterPDF 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_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 10460 bytes
SHA-256: 5c45bc54cab54d5aaec35edc638cf66a4292fe7521392d4202be2f8bc4385986
font_01_sfnt_off00014d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5B 30132 bytes
SHA-256: 8e0a06d39257a6cd009cfbdfa2015ec519cd2d7122fad755959d51ada894545b
font_02_sfnt_off00018fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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