Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5659e4c3beb5b1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 01:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7fc59c99a83f16355b3ee23a337c0e6 SHA-1: 1cc7af774f15b57395976a238397459977296b9a SHA-256: 7f5659e4c3beb5b1140c66adb80cd4c787b6a615642e64fad6f1f976fbff11fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=mobile+legends+drex8
    • http://awarelaxcentrum.cz/user_files/file/fuwubepadeji.pdf
    • http://medical-1669.com/userfiles/files/73592377532.pdf
    • https://renetravel.ro/images/files/1282070915.pdf
    • http://studiosimonepantaleo.it/userfiles/files/53860587116.pdf
    • http://eqletstalk.com/uploads/files/202109070134231784.pdf
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/82147462885.pdf
    • http://to-kajihan.net/js/upload/files/lefobofu.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/50140477.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161464b99f3308---nodujemasebikufumulokelo.pdf
    • http://chapelguild.com/images/usr/sadimef.pdf
    • https://aneri12.eu/res/file/wazixulowesapugusugeni.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/sijarawulitiguz.pdf
    • http://dpnovelty.com/upload/files/38276235850.pdf
    • https://araprinter.com/ckfinder/userfiles/files/55967636557.pdf
    • http://hc6999.com/userfiles/files/lopapipowexasepi.pdf
    • http://rajasthanmetals.com/userfiles/file/28273799256.pdf
    • http://18554080.com/userfiles/file/jamotanudolovup.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135276f6f77e---93208114366.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/38449865394.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b5a83943---18458928098.pdf
    • http://kliknetezde.cz/admin/obrazky/file/safilat.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8B 16792 bytes
font_01_sfnt_off0000f29d.bin
4ae12c4bb500844d112bd4a7889b9ddc3e21ffdb89d4c1f9188be9436d0fedc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 18044 bytes
font_02_sfnt_off0001213c.bin
b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213C 1948 bytes
font_03_sfnt_off00012a40.bin
da8caa3efc2008d12e2fba1a990ae92eb6c363507a1ef499b15bd4f659af0eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 10604 bytes