Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc5d7478a435a2b…

MALICIOUS

PDF

91.6 KB Created: 2021-09-06 12:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d7adb5c424a8891fca946ec5fa9aa30c SHA-1: 7b35f763976ca25fee309eb3c3de8f36c83f6066 SHA-256: 1bc5d7478a435a2b043764c81e1d5f742402e797b6ce11d9157e84256023b2be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=improve+writing+skills+worksheets PDF link annotation
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gitojixizimobi.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/2877144232.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21d2223b0---kexepavorelifetiboginoj.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/31734880073.pdfIn PDF document text
    • http://cochu.net/resimler/files/28854244354.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/xevelerijebo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5bb05f025---72327142395.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/692efffad867ed09d936c933d9f6bc82/nusapesipugozeduzugirilis.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/moweluruxilekoreriwafara.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3aad58fb9---tivej.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nipepudamu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/dufavate.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f602be43a---lodararupojid.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/26659363430.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/kejedukiki.pdfIn PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/garewafobakururikefubakek.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a4042be3---vobotixukebi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aigme21vfs5gug59ba57t1ie7g/tasibi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/99b991ce02d22178a21b3defab6d968d/78174817160.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de0c7c4858bad363cf6cf3fbed661676/75479593676.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/pilov.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/sd5m6ns3p0ar6vdio56chbpc3n/risoxokawebejawakimoxumuk.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/85473761168.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_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10732 bytes
SHA-256: 53afb89bc17d27ed82bd6c004bb61afb2fe0fd23ef5ad90d870ac2b9cce69715
font_01_sfnt_off0001192d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192D 18464 bytes
SHA-256: aaa1a43e7ccc8f6736254bf098d731422608faa64ce4ecd6fcd117653de48cd6
font_02_sfnt_off000148ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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