Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f54a2cdc680891…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 03:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4f8a0ab1da9b222fabde8ac074a046ed SHA-1: 9aa682ade62d6e8048131e95898495468190d8d2 SHA-256: b7f54a2cdc6808910a29a1a36f3d64a474119a8271be42764138e260bfa5d7f5
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. The document contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to distribute malicious links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=creation+story+worksheet+year+1 PDF link annotation
    • https://avela.md/userfiles/file/31038250503.pdfIn PDF document text
    • http://eternaseguros.net/files/files/setuxafurodulesariwawigeg.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/lexozo.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/vabakax.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d6aec04a---12653528032.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109040423493197.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/zafolarobu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edaebb4b6c2---98005398698.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/jiwowikibemet.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jufogovosemudakuribopi.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/856532ae5e08a26473ef5acd1ea0c452/41902847968.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf11f23d4a6---87404541537.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunidivevipegenawur.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16099093cb54e7---54961394395.pdfIn PDF document text
    • https://senhewood.com/d/files/sevijapef.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/l5l3mtrpgd164bidiums678m0r/95299274600.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/logukiwukalusar.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/85972303284.pdfIn PDF document text
    • https://camelcarpet.org/d/files/zeliredugodu.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/83831593394.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/842f9e6c9cb00b0c08f76e611ca19f7c/nifozasoxaza.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a68713d86ef---87820675515.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c94c08dc0c9142de138e464c4ff18dc8/15345746636.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_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 17532 bytes
SHA-256: 206dd3cdac1ac3035684bf2e27fe54e28fa6330210586a2bf0acc869ef5f1a3d
font_02_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 10536 bytes
SHA-256: 94b42e8989639433857a40e446384d9b34f2ed4ba66ff7a821076c8aa350a00f

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