Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3a3b5fedc52aeb…

MALICIOUS

PDF

73.7 KB Created: 2021-09-21 22:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bd0a02d18c078e84ec28f9353be8ff4 SHA-1: f751bc74b1baab7f810f375d6acd4a89367b1569 SHA-256: 6c3a3b5fedc52aebe66527ce880a5ea3366096bacf33dbfdaa16324456393248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised websites. The presence of these links, combined with the heuristic identifying it as a link farm on disposable hosting, strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://al-farh-iq.com/upload/userfiles/file/69174731720.pdf In PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d7517a62462ad353c700e36d7b6076b2/zuvomopeveduguvu.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/84868084511.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614494a299264---40600198512.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109201702311563.pdfIn PDF document text
    • http://efrex.cz/files/file/67022932474.pdfIn PDF document text
    • http://elitacasa.it/images/file/92330082516.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/dabonawuz.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/gobadoruxefademuzafizeze.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/17134659129.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091713483999.pdfIn PDF document text
    • https://maisonforville.be/documents/file/50156371286.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/dorufawuxupojexaki.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7mn5g5tmov3tnqukd2opme4qd/28763531126.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/83570962626.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/rudakogomodizamafuwojug.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918203656.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/36336445936.pdfIn PDF document text
    • http://rcot.by/pics/files/neretiganus.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/biwedutaza.pdfIn PDF document text
    • http://synowka.pl/galeria/file/luxenomurodedurogof.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210902212956.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/44987469149.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rabobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=american+psycho+gomoviesPDF 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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 10836 bytes
SHA-256: b0d9fafd7ca9f9a8b029b5dead4243720943bfd9d0420b1738c7e53041c80d92
font_01_sfnt_off0000d307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 18068 bytes
SHA-256: 682e351ae64fa524eb1fb6e1c434e263fd1f7b5ce88a0f2bdf0da1b4984f35cc