Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b17cb18e86fb7e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 05:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ac9084eec71a845da1914d7436f02f8 SHA-1: 79e9b3b8a0c15777f413d23144b5a2124661713e SHA-256: 90b17cb18e86fb7e7245cba7bdf570eb1f23c7b163f40a9498adb894e3989582
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, with several heuristics indicating a link farm pointing to potentially compromised websites and raw IP addresses. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript may be used to execute malicious code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://157.230.241.115/image/upload/File/48713396477.pdf PDF link annotation
    • http://agarimo.com/archivos/archivos/60445913309.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/e830b401e6f4c70f1a8dab8138402d81/petifegixifupatum.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/70674243526.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c75ac9dcb---fararetopusaras.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ur9pqvogr6i59ck0m7fgdbkgq7/puzalifofos.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/419d74c7c80962962870ec64918c2ef6/12830408912.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/fowapapalupotojurobuzodej.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/zakedazagizadobesor.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/fakuwekepovupupeguwiwotar.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tetiripezabasulisatiset.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/jibibopuxug.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/87246774769.pdfIn PDF document text
    • http://bociany.sk/media/file/35642029915.pdfIn PDF document text
    • http://abwva.com/uploads/files/xelukexo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc851dea71---lipopowoluwij.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/gabamixuribu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/75393858262.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/d5b0a38188ffcbd10af65d4e6b8fc38c/76966005329.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/lupozudojibinepa.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780061446af---xitemafajinuzovugigizifif.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0e022f600---jifiboraxeriwelugelif.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/10574161141.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/xewub.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bccc67c3---ruxilexexepuromeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=stata+14+sem+manualPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/72209499570.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_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 17668 bytes
SHA-256: 6f4a25e914be701079eca60233ca043895b04111e2547d32341941fadbd7cf6b
font_01_sfnt_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 10260 bytes
SHA-256: 654b1fb3a9d25853a4726e8bc10c63df74a2b458e46eddf700c6e3757be3b1d8
font_02_sfnt_off00012862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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