Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7d3cec1ca738f9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 22:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c4064488975a7d29785bf56bc85cb86 SHA-1: 7babb3155f4311b2bce421dee364945f15fa476b SHA-256: 7a7d3cec1ca738f98285e2f852b714c3709026c27fa2afc4245438e64d9b69ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, potentially for SEO manipulation or to spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=thyristor+application+circuits+pdf PDF link annotation
    • http://richardchong.com/userfiles/files/41428376228.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/88699647821.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/xefaviwosulej.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8702b3d868---32256528124.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/winazonawimaxazudomabezu.pdfIn PDF document text
    • https://oferta.lt/i/File/rawufozenejezed.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/89878351918.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/hvkvtuc1m3vppj36erovmlqsjg/23792649686.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rinedebekojul.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/24247297970.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3687e5de9---15372602721.pdfIn PDF document text
    • http://www.polni.si/Images/files/xezefepativirolavujuvuw.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da23224e5d---bufarum.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1611c081c4e74f---pasoxopa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-21/20210621150238762964.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/fesazeleromirudaxuri.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/18fa1d4a81b44609700a7e4b4a1452ab/67622135806.pdfIn PDF document text
    • http://beateromer.com/bilder/file/7905287145.pdfIn PDF document text
    • https://stvorki.ru/files/file/87573617970.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e4e879b24e87a9ee14fb513a2248cf8d/vosolesejisa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e21e19ec4---31609007063.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110397a8879f---78444176675.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29b5bb4770---pufulizidiguxozor.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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16420 bytes
SHA-256: 190d1f7a5320ecfdf637cb12d655fbae6a5a3482b51636fbec86e9ae5a9c361f
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 10764 bytes
SHA-256: 0a9895c926c9e8fbcf683f7f6e69644bf5d516f86b7f0d22acf46f15e94a3c08
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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