Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b35f77facb1fd2e…

MALICIOUS

PDF

89.7 KB Created: 2021-08-11 19:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d2eabe0f7347e21202f101d22a9bb13e SHA-1: 0da22b7104d3cfdf93c6dcf33181be70eb9747df SHA-256: 5b35f77facb1fd2e679aee4def0a53b9a28be7c321f93bae4193848d3bf26ea3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://dienlanhbachkhoa.info/upload/files/70728080749.pdf In PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/popolumi.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/zoworesixafutigokudore.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/34880657249.pdfIn PDF document text
    • http://axwelindia.com/uploads/bafuxexiporimipoge.pdfIn PDF document text
    • http://cissi.it/userfiles/files/71249259993.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8d48a0190---namenalag.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ae382668---wojufifudav.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5fc7239e75---18403457159.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/71062366305.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/84616944479.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e478053cd2893be83c11b14138b74e8f/36437621554.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/havfsfqs4fq9lg61bhp6u2erba/68034369140.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/46852426092.pdfIn PDF document text
    • https://ei-hotel.com/free_images/files/8042471152.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/devezuki.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87ff7a8d9b---borugafaz.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/lewabovixezamenobezi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/10642901311.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/berelalowulosivip.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/cb90842064ffc1abc1036495e1b365f4/54070672001.pdfIn PDF document text
    • https://naoshima-habitant.com/36006657878.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/cfe41f01727534f595916a42b46cc16a/lanunadixizusutusitufira.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/loregu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+backup+app+data+before+factory+resetPDF 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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10896 bytes
SHA-256: 20f96b96430b6c1df3f89c37137de1527929b5c4861ab33909b98a2b555b4eed
font_01_sfnt_off00011344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11344 16780 bytes
SHA-256: da7f01be41f46aaeb88875d231b74ae0210bc76f2563d71b80862385ba0009c4
font_02_sfnt_off00013f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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