Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d437c8f9f06374…

MALICIOUS

PDF

71.5 KB Created: 2021-06-29 03:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f7edbd78a206aeaa14408d29ffe159e SHA-1: f11128aa4db3ff32041d25524269a10747b19b22 SHA-256: a0d437c8f9f06374194d2184eeae080b6b986ccb452ca753abbf386d6bcad270
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites. Some of these URLs are hosted on CMS upload directories, suggesting an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nazrabilisim.com/calisma2/files/uploads/sosolirodo.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0d8937368---gaganavoratugebuzekopime.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/5cfbff2b15dc73920b93477ffe025be9/lerin.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/zuwadezezamawolarupireli.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/27896270817.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/da4ae16f3f757f0fd35c6a4e4ca90260/pavuratafego.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/19070730295.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4841eb94b---rilokovuro.pdfIn PDF document text
    • http://air-ned.com/uploads/files/75519388780.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/rubozulibanisonuxilan.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/bedodigamavedol.pdfIn PDF document text
    • http://isvpro.com/custom/files/josakasavekalujoziruwikim.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/zonerozo.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210521125157.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908b5e2cd3c---xirimozamukixodurep.pdfIn PDF document text
    • https://animaliadielisa.com/file/34915902777.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/70196180650.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e7e34d122dfc3f3bc86ffa6f963dd864/duzepu.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4893209390.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/lgpqqq2kb2saej3jgbgs55c227/29689059634.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/335752af65af28d6aac476649ec720a9/wowiximali.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4ed33907---zutarido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=buzzword+english+textbook+class+8+pdf+free+downloadPDF 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_off0000b5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BE 11740 bytes
SHA-256: bfa3b94dcbc9d2c21f5af47440a10ec5f350ac03bf5caca350cae14804c6c750
font_01_sfnt_off0000d172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD172 15676 bytes
SHA-256: e098d1fb89ab5ec90a736dc7dc327778452026ca6710733c153468c7470b5b2d
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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