Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34487e86c1f4abd…

MALICIOUS

PDF

85.3 KB Created: 2021-08-22 06:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a3d0db881f0c7f694259f11fc718666 SHA-1: 5ab3fbb2fe576292fb83becebbb074d7a300ea06 SHA-256: e34487e86c1f4abdb5b9fe394dc553616023e5122e14ce5a1feffcf62d372f56
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3200cbb71b---lifididigus.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f488b64---revojukibarutupuwazojufam.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/solexugigib.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/wizine.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/judapopokamidodovim.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/kunemomuvoliwusafol.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c940c558---lefuritarapalidogokepuz.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2848be8dd---41978913924.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/zazakiwom.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/solufagirizasewinezutin.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/33521808372.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/7719c60476118608783c3dac0639b8ca/86652607856.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/11e1919ff258a68a0636f2a8d1995067/lanera.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/20874935149.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sasebesapulaxaxelulikaw.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/gafisuwaji.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/gevak.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/talivum.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/zuzurigebixaxexufibopege.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/i6tc1teanmdnj3j79ja2a9sshc/zibowoxigemanozoluwuto.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6eff47770---45116086099.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/94853369067.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8ac2131b59523a0231a128851349e0b4/dunikelezajalupawogenob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ncert+class+11+chemistry+practical+book+pdf+downloadPDF 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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16756 bytes
SHA-256: a69f0a556a052ab3dc31933d68eb0e102758ad55feeb433e403a1ee41de5a379
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 11344 bytes
SHA-256: a384a065bb77223a35e914bc4c5f882dc4239f470c2fed4d61bd38c3b62ba4ef
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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