Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a08f6f54b7be00…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 08:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7f7524514ad4fd49017a283d040a6e05 SHA-1: 4d1fb8d4d803a46a088772b2a268dce58c913c12 SHA-256: b8a08f6f54b7be008446cc8c26956cf0f8f8e59b993b04b65d924ddc7b7febf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attack pattern leveraging external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://crysiq.ru/uplcv?utm_term=how+to+use+ios+move+from+android PDF link annotation
    • http://jeykrishnaclub.com/images/file/lukekiwoxawivob.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d0883766b502fdf98bb030ffab1577a2/61355794944.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/nopuzekofaxigitaxo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0303g9jimalt3oist750jtuloi/48369914912.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/ziwijewal.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/pubiritalesetamagaliw.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/ledinojuxijowojufatafamin.pdfIn PDF document text
    • http://rc-modeller.se/images/file///55913116057.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/givetefetibomosoj.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210904152031_l3wrtr.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c8011289---mutituzim.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/79269383201.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wezigarimutesata.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/moresazatulisone.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/xikinotobapekajodigedu.pdfIn PDF document text
    • https://t2sc.me/userfiles/buvokunubemenumusenivowe.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/92816643907.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/rukewikigixepop.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/kaditopawurexabuv.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3329dddf---33659981197.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/pikenekobapekif.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5876gkcvrrf0gvpi98ml2ao803/bisupikelemiriteriti.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c9b029f0---witoj.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/74881079942.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/muzefu.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/jarotegapeb.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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 10712 bytes
SHA-256: 34932c5b15037d870417db6127f60769e5760d3c596c03750e78384ac3736f7b
font_01_sfnt_off0000dccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCF 16088 bytes
SHA-256: 11a78f5a4d13ca9347e84ae8b0855e2b1ecb3606666211fa70624dd89d393511
font_02_sfnt_off00010600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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