Malicious PDF — malware analysis report

Static analysis result for SHA-256 39701b0ead7d6a32…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 10:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75e8f14531e999d484fa1e127128d59f SHA-1: c298809c6a39bb573f97354760e089b2e2ae37d3 SHA-256: 39701b0ead7d6a320c138a48df89312a56dfc0a924b8773851932e0fafa3c4d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

Heuristics 6

  • 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.
  • 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://chanakyaaerospacedefence.com/userfiles/file/11955116526.pdf In PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/pevumazi.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/lugiwaladokisoroxumaj.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/55841530509.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109081130111525.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/34329578053.pdfIn PDF document text
    • http://z500.si/files/nupibufawana.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/lezafizewix.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/tijuweganupomirujazig.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/19072701354.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/28670698097.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/pobobinezifetunetug.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/96268336052.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091223512480.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613292c90efc2---86652991322.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/negovizufivosiw.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/piwagetaruwuxoz.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130675d807a4---morilulivebuwomaxibi.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/29705987782.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vuwajojixasoladivafex.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631415121GAgs.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0u3h0a1pojlanvglrvittvl159/21494234787.pdfIn PDF document text
    • https://salonrewards.ca/images/file/74515098336.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xoxep.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/55974771724.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/togejipuxemupixafogapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=calculator+app+lock+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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 16812 bytes
SHA-256: 9e7af975846101391a5c157c94fa221ae37fff7f1014d8f1929153523cb905db
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10096 bytes
SHA-256: 68071845a1c2cc0c33ebb8aa2edc2f22920489f0d9ff320007bc9e93236168b5
font_02_sfnt_off0000ffd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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