Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7e2ba639bf6f87…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 21:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7937eb024927ff8aa26715c2c72ce5c3 SHA-1: 51b212a8e1ca7928c04f0f2c5bb7c0b01b131034 SHA-256: 9a7e2ba639bf6f87ff002b41a7488d2a231bc954dd539b7f3a48d5bafbb64259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of urgency lures further supports a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate it's designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=pupcet+reviewer+with+answer+pdf PDF link annotation
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/79520973159.pdfIn PDF document text
    • https://citytrafik.nu/images/file/12162045463.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3d57ad27fb1d459907899f2e69094fd8/fikogovemesixoguwejej.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/a6obrst54di6kv4lm571b67cjt/lipududozeson.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/33010828543.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a890ab02d9---winumidobowowotesarurobov.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/zalegatuzarikokuxezebo.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/98941237225.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/adf18f7b6bdc04980872dc22750f4763/tuzogopemafod.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/vedepisogugigodokiludol.pdfIn PDF document text
    • https://samowar.ch/upload/file/davumosonu.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wuvudobenowux.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fiduvuwodelenanojewotal.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0612eb18---81406966366.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/508d68e1f18f003dd87df88bae437226/xosanaluxidikelug.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a147844adcf---8457859210.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/28121871814.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/10973070240819c28dd47116121b17d7/56987351785.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f681d965331---79587205329.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/33875538378.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/13607942811.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/fuvewukikuropitalawusenos.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_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 10804 bytes
SHA-256: 44ce8e72d0acd67c9ea1147951a12216c0eb377991e296b78725c905d6547ff8
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 17772 bytes
SHA-256: 207129e64f2b5211ca6f4a1ce09d1ec3525fd921260f1525044cb2053cd7fd79

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