Malicious PDF — malware analysis report

Static analysis result for SHA-256 b644ec214606b1e3…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 06:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5755020f46fc5edf8387bc15db018a3 SHA-1: a9d79647b74e462584bef20e5499dcdcbc597733 SHA-256: b644ec214606b1e394d02ba43961bf8694d59287230a2df621f27206f59043c7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of link farms on disposable hosting and compromised WordPress sites indicates a pattern of distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.look4job.gr/images/_user_na/file/malisidupive.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4b47be3ccabf76a060cc7af52b393ec9/davetewixasodarenebarubo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0920a33768---57687982500.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34ceb13c1---ledikelizebipina.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f16485e8e1---97281040700.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ba3cc120636ad0a108017014658b979e/41263876189.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/najejerepalovamenufojo.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/mivedonapejozewurazok.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/64042932848.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/686b391f421654cb49ea4ca87551dad3/kuledajajokuziwe.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kseefsb5knal35hngi4siiok0p/76714740981.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qcvmk2b13skrk0p6vfv6o72i3f/66687119341.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/98115662492.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/57270784828.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/bbab531c7ae921358a853c1fe5691e42/66167888333.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210721_1F687EFD199B4D3E.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90c7a6fe9---67258525102.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8304322e8c---jetipodideduradu.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/wugudo.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/rajolizosisawovaze.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/bidebizafuzusokofirudul.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada66c56b20---41633117244.pdfIn PDF document text
    • http://talleresjpg.es/img/file/92891743923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+write+a+tenancy+ending+letterPDF 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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10568 bytes
SHA-256: 27397e8a2881f3155db1358fa5d436c4f2fbd9c8cd73b110a653a04b4fc2b245
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 17392 bytes
SHA-256: 023fa672f3616b36f1c24462566fb5ca00a216215f009712162e797ccb1ff7bf
font_02_sfnt_off00013a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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