Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9594cab22c2ecf8…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 23:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 81470960c56b233f5a3030afd1dd56ee SHA-1: b9738a782b3ac6a0639d177a22c50702a8ceeb50 SHA-256: b9594cab22c2ecf84af33cadc979c90554e73b30fd167635ab266c08bc8a6321
176 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/b261c77f0325d865d100f12e3b1b5f13/pusumutegafow.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6527d435---81124107741.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608835fab6bbf---40344749147.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738263927de---xobabezat.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/mezavomuxazo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3f15d6b98c218ec7ac53c16431022e5c/68583900626.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/92232957238.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210620114807.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/09/file/20210609_180544_124.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609279e1a8698---gofasubigipevaxatog.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pofoki.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861beb461c9---samewafovukiletagibaj.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/fb1f2a3ec3737c71f7743c10012256f3/peduzelumewo.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284d1e6074---94907852624.pdfPDF link annotation
    • http://geredekombiservisi.com/userfiles/file/gexalanonizumilateza.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/12877984446.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/nulalerupebujo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7b4cf3ef5750f25b5195353d393dd085/33845287716.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f90ba6099385badbf8bea68327d0df3/52184784590.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3cc79afc---37647404328.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/fewemujukikefomu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/800073b4effa86f9f537811371137856/58072266276.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/17872275560.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/9d6615f5b40cebcf86b18d6edca51be8/ziposegolaxadubixija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=if+you+are+self+employed+can+you+apply+for+unemploymentPDF 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_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 17268 bytes
SHA-256: a3439dd62ae897ef9e226db8f331e427739479886c19179150c0edf088df5aea
font_01_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 10856 bytes
SHA-256: 1640e36672b85ccff4673158dcf34d109c7cd102d2af62889278f6b5b3c36ce7
font_02_sfnt_off00013941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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