Malicious PDF — malware analysis report

Static analysis result for SHA-256 9764c6c69fb681a1…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b6034f28dff9f12566c1970a362cbde SHA-1: 5704f8b94309590e77ed56802fceae09a395ca5e SHA-256: 9764c6c69fb681a1251417382990ab1a35392f16b681f06de5bd8dec0134258f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. While no executable scripts were extracted, the PDF structure and embedded URLs suggest an attempt to direct users to potentially malicious content or services. The document body was unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbfd28b86---jitupigamej.pdf In PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/m3nv575kiv0l9epmk1ll17jrv2/88364823132.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/26303954301.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/19650951291.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/nodaduwegamarujawigu.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/raxar.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/woriterawukexizodolomu.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/32864850875.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781aebffa---fazatawejesinadobosubiwo.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/buvulenusuzij.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/xugakuro.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16130a64c75289---mezogafagegedafomulat.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/67166706020.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/85038622269.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/ludivurifukajubafojogini.pdfIn PDF document text
    • http://jadeite.ru/images/file/12686093802.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/74158533471.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/40184083480.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/jesupemerogajigimamizef.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/novuwesubepigukijuvefawi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/lisepolujum.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/47649414511.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/tunusakubukedekotaveg.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/70553320827.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/purorefanutakodaripox.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/taxubogipiwubirudira.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/72912863052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=imo+latest+mod+apkPDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 17412 bytes
SHA-256: ff0f45272793cd538c8874761f5d341679de71416e013c0f83a14d5feab92cf0
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 10300 bytes
SHA-256: 17e0618f4b329bf24fb485149239c8b4816fe3e72e7b6df891b5949555b2ee39
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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