Malicious PDF — malware analysis report

Static analysis result for SHA-256 76db04f43a97b502…

MALICIOUS

PDF

80.5 KB Created: 2021-08-23 16:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 11df95cf28428dfff329827d9ea21dc4 SHA-1: 038ff2492ed2c4c608ea81cdc611eb8d596a4f9c SHA-256: 76db04f43a97b5023d2d47972aba9b6de95974118a7e55fbc8825461d9e7d7a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=the+street+by+ann+petry+theme PDF link annotation
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b606d6e81b341f1d993ee40fbfa03b07/24494887974.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/gjrfu2tdcq8iu9epqul3e940v3/15039349268.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/6221ca9b7a6058603fabf4f4b3ec5aad/kasufobosu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/dc53b7a1235e9f4f145bce00d7a61042/84983363060.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/94194642039.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/9c06ed1920655ecf23b5961ba15d25e3/pazebavugokifibifijogozom.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c75a79274---lomatogoxidaxunixaro.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/1170573643.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/73933953774.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kokebafanexoxugubowafuzo.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769d537e036---govodavavabas.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1c233f34f860eae45cd00bcdb47ff166/zaxomidelu.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/vigedivaku.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1024200e---86196759937.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8992b1e7b7bda293f4f0e2ad58257506/neveguki.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vapivuzenujunozazumex.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d9ce8a13cb1d6fcaf3ac71be44e803fc/lesigafejate.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/ronununud.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/nj2cofm907t7o8p9ucisqjhgag/dimukenikowenuras.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/99895724242.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/89795213273.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16274301221653627085.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kuwetov.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/19228332211.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0a2c1fbc875748322aaa3b2e24678e65/pemoximagari.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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 17248 bytes
SHA-256: 4147db55910fe3b3ad77c1608a5d3952a4738c0e6b30f7b10740932dfcec198c
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 10476 bytes
SHA-256: 6444e49d6d7066bc7328eea738d8d7971ae15e3d6f7429e84ce2b7e49c98e0bc

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