Malicious PDF — malware analysis report

Static analysis result for SHA-256 e689ece348c9db5d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 08:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 998b7c46a7b3d9d0421f4546f3b6f649 SHA-1: 0d98144c008b1071715a7d1cad43ee04ad61821c SHA-256: e689ece348c9db5db3c96ffca9eb29703288ffa0c8ccac0a4c4a4a6469e409a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links, including one pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious or phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://matrainagycsalados.hu/userfiles/file/wuxufimixalimudojazipom.pdf In PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/gawibelasawamiz.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/zovudagewetig.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210705121331.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd04e6b740e54a8cfed28939ae7bcfe2/kegopotukuvaw.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jgmmg2am1a1a9i1ejoj1432336/getuguro.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f1bd0978---18672393045.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/dolirukusaxet.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/mugeziloduwixajo.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/fazopofafafunorumilav.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/80034794292.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/75993404358.pdfIn PDF document text
    • https://faceless.me/userfiles/files/gobiludod.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cce4d0f15b0---pafedebowufesiwiz.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1e0416a89986a0a4087d0d75b19db7a6/5070363842.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kaposerazuxito.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/7747c2e6b4169e40aa2aa8e45268056f/pavitapa.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/caejvaonj1rp3oqvjfvj8pkf7c/75056822811.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e159539ac94---29527452597.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gmve15rhpio1q22ac7efhc4pa4/mupiralosaletitesarevux.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bf254d3a06e---vitogolalar.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/jagovarulufuruxe.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/butizuxavovelejemaseja.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0c93a508d9b1debfbf3965e102e60dc8/12452201147.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e27e27dfac---46796753341.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/34127408379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=scary+movie+1+torrent+magnetPDF 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_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 10668 bytes
SHA-256: 6fb0e093f59ec8d7e1d35f690dace193785d48920cc51552e7857223322c66e4
font_01_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 18656 bytes
SHA-256: ee5285c69df816b47caf1d11568f8205c9cac3403a4c7a0eaf0e5a98b748ce98
font_02_sfnt_off00012830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12830 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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