Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d142f2bb70911c3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-06 16:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f118eaa32ab10165a49de975bbcc4bd8 SHA-1: e40cecbd17d949d1cdef56aa29f472d3221ac8a9 SHA-256: 5d142f2bb70911c33551f7d3691aec9d08852d326b54db286594bab065d540dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://garglob.ru/uplcv?utm_term=arreglos+unidimensionales+y+bidimensionales+en+java+pdf PDF link annotation
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc15337e30b---kelififinipowofidoj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47ec2b2f5---60119795843.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/51073341137.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/newududijazijes.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/nogabazipoxuzewutetubadu.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/97079844977.pdfIn PDF document text
    • http://abroadster.com/files/27322019618.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/27148605502.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/debexabixulebexibufuviw.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e6c4b29bc---71236513539.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/58880409137.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/wexorodupojo.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef290f1be6---14426539481.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9a99d6056---tibabasa.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/36141319102.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1cac768af304991add2a15b8c50412d3/16093934550.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aac1862ed2f---walubevusemisisutu.pdfIn PDF document text
    • http://emannsltd.com/userfiles/7357314927.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/23651183893.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/35680813273.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/18957865485.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/71984377926.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/70246781303.pdfIn PDF document text
    • http://bwc.lt/i/35870930339.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d351f2d998---26243266.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_off0000c51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51F 17788 bytes
SHA-256: d5c942fe4778d3eda2419c6d43beca3c200d109a012076d4d3bc88e1a28a48c8
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11272 bytes
SHA-256: 3065adb347a149326e550611d1dbcfcc513b6374f72f23bc8956c09d8e1636d9
font_02_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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