Malicious PDF — malware analysis report

Static analysis result for SHA-256 4711672e8257d8f2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 23:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f337b2d9bf272c16d609e53aa9e6eb0d SHA-1: 1271491b5df0816fe0dadd50b4cad4f0d5cbd81d SHA-256: 4711672e8257d8f2a90f043eba9128611a8aa8a9aa129b4d76b71ed80a8104b5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4121

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.
  • 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
  • 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://laborke.ru/uplcv?utm_term=jitsi+meet+android+sdk+customization PDF link annotation
    • https://tarzminder.com/resimler/files/80540183295.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/zibofapipamupesepanidoxas.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327ea4551f4---20847188100.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/36470996145.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109041721392537.pdfIn PDF document text
    • http://amandamaitland.com/images/file/vepubiresuferag.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/tumus.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/jedoxawukixu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hukl8q3npgsf9luom4971lurb6/39286434065.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/nijulogupaxixenevudu.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/roxuwibebababinamuluni.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/legasexelojedijowuvinajo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/neremozofokikadozotagurel.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bofemukages.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e21ac0821---57129014680.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/lugorolovolivowexuf.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/buvolexiwuwasa.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/86221354783.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161356978d6c7b---4926178684.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/70823729744.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/fubezosevi.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/66711121498.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/daxokafisilejolewafunosu.pdfIn 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_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 10728 bytes
SHA-256: 0ab797a10891de9320491cb0f2018133d02e252c1da7c7202d15548c007ef6b2
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 18732 bytes
SHA-256: b837c871de17a85d2872fdb1d29a154458c90fc58fad5397e74a5ed27f355b63