Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71956623ff2406c…

MALICIOUS

PDF

93.7 KB Created: 2021-08-08 06:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bda6d1ccb7a43ed882671eabc7acf794 SHA-1: c642d3b8cedf706fb5d864443c89780e4fc69625 SHA-256: c71956623ff2406c024b446a874332883663bbbf406373196c1c64a5a55039e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=lexique+m%C3%A9dical+fran%C3%A7ais+anglais+pdf PDF link annotation
    • https://mo-space.space/web/img/podborky/files/koziwuzisonofixizoduruji.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4cf07a66b---71673625960.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/19577257896.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/58976949807.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/30427800159.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wepoledife.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc917e66b---xebevikodusalowagoko.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/16841839924.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071491542ea5---96606409492.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/82ae3tss40ss6r0pmps07iakkl/96365885771.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/2439175506.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jotazekediz.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/fapubu.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/58370191257.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/18ce5416cb27740b21e039f57c0ff184/47372574678.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9427c96e9f2e825b9f29da72f8df677/91345628710.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/lafewibadejokoxebinufo.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb91d37d4c4---70415778934.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/0frg8b0h1knjvaoba1d5sor3dr/6588665512.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/66100546432.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/kadupugisolujogo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090472949c3f---xejudozowitipalekox.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab5cd15fc---viludugurikurujitusejamo.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/jumusofomuwaselonozukokev.pdfIn PDF document text
    • 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_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 19960 bytes
SHA-256: 1617ced6d53fc4578e934beed5f2ae8a0f4b93d43aea6be523e5652667b023d4
font_01_sfnt_off00013407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1E 11400 bytes
SHA-256: 6d74c1f9b2b0f710364aea9ac796dd049359e8ebaf11be2266bc1231fa2312e3

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