Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d223e1d4d340536…

MALICIOUS

PDF

78.5 KB Created: 2021-07-01 18:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef9328e3e99ed3f503cfa86c26cf1c4 SHA-1: accd466dcc523b2c55dab7547286e196f1733c5d SHA-256: 6d223e1d4d3405360e0ee6898063787c6248892dc7067059ef07e3743732621b
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with many embedded URLs pointing to compromised or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://stalmost.pl/userfiles/file/15187613873.pdf In PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/sdiug48ql2i8oo4kv9fltgcjsm/nimepov.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/939fef5fe4c2da5aa035841407ed1782/xikebusogibek.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/kevefo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e878b2add200fbfa5ec8978a4720dcf8/gexopobowupax.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083abad8e57e---raxevivazixu.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/waxod.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/93334420e5f28b484dfabb52fd698fb8/fezitidom.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/91358d27c3cd609f1e5d4ec94fb095e9/36139589870.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bokob.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/51929181994.pdfIn PDF document text
    • http://bienbao.org/uploads/files/lepimalopolij.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/93857907384.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lugizuzita.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/13317698867.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc12db9f3e7---91082101604.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/65197294319.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bojexoloxatako.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/wosomosanufire.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/d06a8eafdd8565735ebd7049972b28e4/lenimirixusosomitibij.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bde149be9f9---gofarafajasizovumuf.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/felinuxowire.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269232de7d---vabeneke.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/7a7946376d4e55d5b8cc69d8949ba484/zadomogawuwokoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=small+business+start+up+costsPDF 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_off0000d01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01B 16960 bytes
SHA-256: 32f1e51eeb9a85b7cd7e5f4043eff52d82f110d6972b297dea74e1ece81720b0
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10848 bytes
SHA-256: 5562eef0069c3753850865c4067d199382e4dc864aef9f69f21eddcaab72c290
font_02_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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