Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19cfaef53406962…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 22:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 078245807e57426236459fa9b9c66732 SHA-1: 8fe6ec16eba0357d5a44a03eb35aed00e316f3d1 SHA-256: d19cfaef53406962a5579d2119b8e1b67fbfbf9240484b6dc19f0b022a7c421d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to phish or distribute malware. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • 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://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdf In PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4483c240f5---taxedituvabexawopaz.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/59403077173.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/vudebawavunosanowipipu.pdfIn PDF document text
    • https://buka.ru/sadm_files/vijebogakelugodujipig.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/puloborekorikabezasapub.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/bezabarogajifu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c69e70fcb1---19863370194.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77fc7c8af---63194911254.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/24f1ffa7837848f8e9e36b8ee6da3a63/dapizamulivoriperavoluk.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/96817058342.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///naxajoto.pdfIn PDF document text
    • http://qca.ch/userfiles/file/loneparozuga.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/53982367285.pdfIn PDF document text
    • http://liberty67.com/clients/41815/File/julinevasava.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c578063ff---lafonubasinaberaberizuvi.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/sasuwidokafaxelowizosazob.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0064c6023b---jizulojiletaku.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/7460258817.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76464523073.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f3d912241a01c1604676781faccb08f0/22718898656.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/4232741780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=citroen+jumpy+2016+pdfPDF 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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 17164 bytes
SHA-256: df8b3e4d0f7ac62d748dfc4eada92575a4d1ebc6c5bf00ee0d0edebca5b40c43
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 11120 bytes
SHA-256: 20b9a63fbfa2ba8b088410934d3936194dc037d82f49a9a0110e587c7358cf91

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