Malicious PDF — malware analysis report

Static analysis result for SHA-256 b977abff73d72cc7…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 01:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87a1c90aa2d5460b2cb7e9be984b3832 SHA-1: a1b05c28ae67b74eb2ab6e3a3e2cb0851d236340 SHA-256: b977abff73d72cc716e432fe0a8deb492ecf9b694c032d4fb63a884919abac9f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of link farms on disposable hosting and compromised CMS upload storage indicates an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612510f03118d---93777105501.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bb0382a0d7ee8053d20bc68ea079129e/40574170414.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609e831924db1---zorinuwapifoxanupon.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/58a28a3590f11598276af9b2168dbe37/92766457461.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/kujajefolosufofote.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c34dad642a0---88936160943.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tolosaxuwexis.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46b24ee63---lopike.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/2479c3e612a0dd4b6c1136cbe2353875/duzazu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/misipefelumodoredu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117304590f07---92403269261.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/gezekubugovadubofib.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16078b0785c70d---lolalularijiwupobujokanil.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/sezixojiluzipifolutupo.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e97e864fd---zabevuduwikusepomezofozu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/lmcc9gddg51kbtnqb7jdb2tad3/95977296934.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92ed7af1a---24771871339.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3691f614fe---sigesurodipoku.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/665982064.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accefe9ec1e---6652690640.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/xusadowoganazulik.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/pivopopafatemurezaxu.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/pagusevidubagowopolosemux.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7hg55bm1ssntd96n5oc9hjjbs3/15116296670.pdfIn PDF document text
    • http://dogable.de/userfiles/file/wajizareju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=centuries+ago+in+an+ancient+egyptPDF 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_off0000ced2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED2 10748 bytes
SHA-256: 76f2df6e17ecfac8e68ca468dde8c31a20e75b66d2bad3ceff345ef7095ffa50
font_01_sfnt_off0000e7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 16568 bytes
SHA-256: c6f4ff9ec13e87682371f3fa8cbed93902bd086ae3a6058e10cbc561858f5f13
font_02_sfnt_off000112a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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