Malicious PDF — malware analysis report

Static analysis result for SHA-256 50170b4c536d40d9…

MALICIOUS

PDF

87.3 KB Created: 2021-08-22 04:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed48836943d3518feef19bffafe0994b SHA-1: b2e027b8fe1babbd45b2664efd9621d09814e255 SHA-256: 50170b4c536d40d93fbaab5fa01ee9d9f7a00686aeafa2e28cc25a64fb3f923b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://stlnsk.ru/uploads/file/51827008563.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46d4097b82---63890010689.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/97862296962.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609082568aed8---pedupigizagameso.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/84995440138.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e01632a03db---tagazulodekepoguwiwosox.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ogeq3oim25ig3rn36prh2rl4ff/23213328848.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/kotasidosovezasepibimez.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d28a25b0a5b4853608896d6bb55b3816/tupaporogujixig.pdfIn PDF document text
    • https://signika.pl/Upload/file/55903555370.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607463608ebbb---74962657446.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/880b498c94b9f0efb11b1724a2303b27/jarijalokoludaziw.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/sobopadulus.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/10818715466.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/46390209906.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfd9bb944c---gadokef.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d4d0aa55---80790137169.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b346efae---46979548405.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/34463583162.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/91520357934.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/28522974414.pdfIn PDF document text
    • http://asfalon.com/__files/file/tuxetijifufamemixag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+add+guest+additions+in+virtualbox+linuxPDF 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_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16760 bytes
SHA-256: 5ee7a4ca86e6f15a0b479f829244423ef0963b05698120b51cb6042b9479aaf6
font_01_sfnt_off00011d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D39 10908 bytes
SHA-256: 788eb1b2b1bf3957e8467f36501a48bf1cc6cc3526403f426737374c1c500338
font_02_sfnt_off0001366e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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