Malicious PDF — malware analysis report

Static analysis result for SHA-256 123d7680a65699b1…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 23:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2500c4df54adfca331c392725af59c97 SHA-1: e2aea6d3832608d2e1648a3497aae363946a9db8 SHA-256: 123d7680a65699b1933de2dd6cecc61433aafc002aee3365e9df18c602c54644
196 Risk Score

Malware Insights

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

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update to view content, which is a common tactic for credential theft or malware installation. The presence of multiple external URLs, some pointing to compromised CMS uploads, further supports a malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=most+secure+browser+for+android PDF link annotation
    • http://mdsalon.ru/img/lib/file/76432321396.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fevof.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/8373759433.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/fd45ad7e976418db12b9e2cb1bd17e7d/12576890926.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45379492071.pdfIn PDF document text
    • https://rm-parketi.si/uploads/66818500660.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/40109595978.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nn0b8bhl6j1fh4nd57mavp7hce/36426711333.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8ece1bf68edfe484f6ca9d1ca7ca9b0f/42940640669.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/noxazutigeduvo.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/33472674293.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/92718403713.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/63554095164.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/mevajajebafuzufiso.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xibizudibozurujofateri.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/43922112719.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/31723491887.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/wemubirala.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/gipowusepeparuzosa.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/rejagi.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fivewegimizafaxol.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/kokaw.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/mezonegimavivegoku.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/31124312936.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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 10740 bytes
SHA-256: f77312f16ceb412537566dff5438fa3cd66eb2341ac2029a2c943d031eaa2be9
font_01_sfnt_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 16712 bytes
SHA-256: 788d5a62873dfc814c809e06949c2a2298edd847d0dc33d5afc17b0e5e1d1719

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