Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca1b45b4cb3e5d4…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 07:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1812e5525e2c898e906266cbb5081195 SHA-1: 5337e9e6c89f6bf640f511dd1d4cda747d9ed605 SHA-256: bca1b45b4cb3e5d43e0b68ad90589121fbb66cffa1ff254b0ededdd4dd6d0f8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous compromised websites, likely intended to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan suggest it may attempt to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ff104526---modavowizoxurax.pdf In PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/55836230280.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/tujagiwadaguvozeji.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xokolufofijasesan.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/2juta8lvtl0t22nurfhcqdpdur/sajidigetu.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/42197574496.pdfIn PDF document text
    • https://heyratacademy.ir/file/litevunotogalivarafolim.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/jevibo.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/f5k73ke8nblv08crbq209q6un8/nudesawuxuvufimisonoliko.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e408321a9---21009812207.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/lexumuwebadumosazox.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf246e90b---70215885942.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/92292390694.pdfIn PDF document text
    • http://novichiha.ru/pic/file/6949744638.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc69c40897---wazereporetawak.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/49340131118.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608187d3b56d7---zaroluguvekuwupopufep.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/wefuwawimofilopuwixo.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/a493a74f5d30197f831d63ebce75068d/23125288971.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/71164455476.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/mufivudanox.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a44c6936786---13629393740.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gg0s14lkkh05bbubqeki2fa0nk/31105177332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=compliments+starting+with+sPDF 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 17500 bytes
SHA-256: e6a4fceb6d2079505e5ce15f8e380e40556c2a9096135148b42e2f8808b8d1c8
font_01_sfnt_off000118df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F6 10816 bytes
SHA-256: a39d3633c007d277ea41326fc05a4a1eeb64100bfb1b9ad6c90af3f281813e0f

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