Malicious PDF — malware analysis report

Static analysis result for SHA-256 caec5945e556321c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 23:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa5439aadb0a53dd224dbd913dbec274 SHA-1: b2eeaf250e288d2ca8c8325f8a79fc13d6038c00 SHA-256: caec5945e556321c56587b72137425ff0d1999038c0de008ace2f50083a498ab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it's an image-only document with an action trigger, a common phishing lure. The document body is heavily obfuscated, but the presence of embedded JavaScript and numerous external links, including one pointing to a compromised CMS upload, strongly suggests it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://sgicorp.com/userfiles/files/xapogakewuwuf.pdf In PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/61348559874.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/42184910816.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/12282569246.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/wudetexas.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d12adcfae---wadodanewo.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gezas.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411344bedf1---30613402176.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/kopuxo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sorutusova.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/pojezunojoxulewamewenabo.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/files/33315043303.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jineviluxokenizilofulusim.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/doreredewepanaligadevu.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/dizuxekebutatikalarofom.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/gewinatafivijofeboxam.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/lalevudebubiniko.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613477c2bdc0f---58217031078.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/gutofux.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/puzawabaridatakunasal.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1855bcf04---rikukobiti.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/bujexuluv.pdfIn PDF document text
    • http://www.moyekolodin.com/files/metikulomamatofamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=apurba+sastry+microbiology+3rd+edition+pdf+free+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_off0000aedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDF 14488 bytes
SHA-256: 379e9d8248bfc2cc5484a120be3465f1816b6d95cb31085c9b54bff518480653
font_01_sfnt_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 11556 bytes
SHA-256: 26d59fd64d4288ef9340b934a6ef1f77a71a387d83bab287906afcc0e670f692

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