Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c64f2e38a3f766…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 01:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b643d45926acf4dacc59fdb3523d6358 SHA-1: efbfe3064fa906efd8bfe773e56c3b23122809ac SHA-256: d0c64f2e38a3f766a871a7de6396abd2ee5ca5f2002e51529c408405eb0f6138
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malware. Several heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://sanruou.com/app/webroot/uploads/files/88735308016.pdf In PDF document text
    • http://ty-int.com/files/files/dulisolubaj.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/gekulelofasanixaxif.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/zavaworunete.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/63220665512.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/82383582405.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///36940613129.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/66222675933.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3e3bd1546---fojebosato.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/wizesoruki.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/80714746421.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090702371317.pdfIn PDF document text
    • http://esangsok.com/upfile/files/61715193598.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/bemuwodekolabeda.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/vatifasabik.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493ac514384---golivofowig.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/kalozim.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/kumepefupezitag.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fudugapexudov.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/vibadageduruzufobel.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/bidiwulujenos.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/77397768785.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/pukoropafiwoj.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f99a9ae2a7---kagawadijubuwefof.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/20241370530.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/gikolezawefiketed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=clever+mobile+call+recorderPDF 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_off0000b155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 10400 bytes
SHA-256: da2428ade8d24c6fab4bde941e6d485077fbdaa7771ee7aabc03cabc8ef20434
font_02_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 14624 bytes
SHA-256: 49ff6f87404938a28bfd6c8dd6caea4379c4db9c9e96790cea85ebae6a71a7cc

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