Malicious PDF — malware analysis report

Static analysis result for SHA-256 192cfa8f1d909905…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 08:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f821f540793f5533fbad75b1692ce266 SHA-1: cc8c89968f606025b52f85d31973500dd85f32c6 SHA-256: 192cfa8f1d909905c5b48b2a338672550696c8017da417bb52f3b32173cf8240
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or redirect to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dcdd25c02---jolusipuge.pdf In PDF document text
    • http://jar-ted.pl/file/jaredupax.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c926189956b---44374168109.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/binagujuwag.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/dipolenusezavebawoku.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/80004452575.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/60m3jkkkt3fujk0oi8cvl6dfat/rejoradozumezilewozawataf.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zejix.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/numiwodijefokegidafiri.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843df17e57f---7598853956.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/wotegenuvowujejunataga.pdfIn PDF document text
    • http://industrialdevices.in/uploads/93190063682.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606fffde305b8---burevijevip.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/pudasafanoduvoxamulega.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/lezevizaga.pdfIn PDF document text
    • http://moristas.com/userfiles/files/zonosulolifomijuwat.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ffe24407---jibalabuponudevazabele.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/xamapobusaxasifirurafegib.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/20866577341.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/46c462d7dfe9a18d73373313dfc643e7/93357453959.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d8d08d9bd1f794267c860adbb9af6f06/63036958083.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd0799e80---zudefexexalefivuka.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/kixapusagapiwaro.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/borumudosasozirodibogozeg.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/befur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=sociolog%C3%ADa+general+y+jur%C3%ADdica+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_off0000c56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 18220 bytes
SHA-256: cd4a9d28ed120405536bc628ebf6a96e147a1445913b06797814068cee406f00
font_02_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 11008 bytes
SHA-256: 9c28381b2e78e122a3e1d2f8996549ea6169ef46b5aab9a989aeea0baef0a583

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