Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a862b99c7489c96…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 03:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3916c11b37bb51e95f63de45a9ecec08 SHA-1: 0f5ecb6473054752226135ef55fe3690ee1ed55b SHA-256: 5a862b99c7489c960f05d25a9e68876b803e15e50a388e899a4d07e1f3e0a886
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to be a screenshot lure, typical for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 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 http://manegedebuitenwijck.nl/uploads/file/dirurixurowilodamifusuzu.pdf In PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9cdee0801---puzex.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dapetiredabo.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161559b234ed8f---lunedevamokejamafabogixa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613dceeb91c52---40521899885.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/rexeritikomomib.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/44140563346.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/2732946313.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210908072830_8lmon3.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/091247412369.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161365d69057a4---62769051992.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/zunujinalilelabopu.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/7603824962.pdfIn PDF document text
    • http://juncheng.tw/upload/files/6574053897.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/13075048736.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/winoloxagakegapa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f3ab063f8d---pinoxikowipopur.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133c572d3dac---nugodejerivunibe.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/61173487963.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/65831198122.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/budotetibelunuz.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/lugitumivitivizemak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=please+excuse+me+synonymPDF 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_off0000b12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12F 14392 bytes
SHA-256: f3034ea96fa3aab48997d4cae347c52a2824d92a9985aadd1d889716e7619678
font_01_sfnt_off0000d4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10420 bytes
SHA-256: 2d0a3c9f4557f36e0b8a79bcb05adf896b36833746115099e6683191e75b9a12