Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b30a91207442a8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 12:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 626065641a847a20c6871d5df91c219b SHA-1: 7f2f6cc36b11ba05d1d76d7749c8291fba9a1b02 SHA-256: 89b30a91207442a84dcfc92edddab775fe8ff69abcc681ca4589dc8b098df43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=language+classroom+assessment+pdf PDF link annotation
    • http://3wsystems.com/shipinc/userfiles/files/35366028891.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098789bbea4a---bubawuziwasirupepokeze.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/porusibipe.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cad88dcc8e4---sokigokatifemoxarebozev.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0ab27451---bebofelexow.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57337aca8a---fafenizaw.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622316308.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/43196847132.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bcf5e9c3---tesojimizakuburisazudin.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b610a10f9643e6caca5b47137a39710f/71699796276.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///votodozen.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3d67dce0b0c2f38b10d760e25217f0b/32030859772.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/81851864017.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/1b75222ec18a062b095e7fe12f388d85/fatejimokis.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/wopezutus.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/78228517701.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/55975439789.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//bepodukonubikaxug.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/87099827815.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/70110782486.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1f2ac2afd190faa34787b6f3bad194a/34156581871.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/75628386597.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_off0000d45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45E 17268 bytes
SHA-256: 70aca98df62665634977e87800787fea6820acdc26b928bc597a5f1c6ede3587
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 10928 bytes
SHA-256: e7b6c90fa787c4f1c621002d5f0c31339ea1a39638af2ecdaf6f5dc947eb06af
font_02_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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