Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff13477e2c02f31…

MALICIOUS

PDF

94.8 KB Created: 2021-09-05 23:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a23302c676a7b18b3870b0a69056f8cc SHA-1: 9307211be82d2b99e0c9ea93fd78d0b18128e1bf SHA-256: fff13477e2c02f31eacc5914408b5d07bbc2ccc06ace194096d4dcd29dbe36e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it's part of a link farm or phishing campaign. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, aiming to trick users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://archism.ru/uplcv?utm_term=japanese-language+proficiency+test+official+practice+workbook+n2+pdf PDF link annotation
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/48170021072.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/mccsrucqrqp8d6089ilnr7ntv1/dexemopedesujutugidizevu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e4d7018e85225624567a6da1e0077950/fiviboloxokuketop.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xubapelufekojitoze.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/manulujimeluw.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/wodenavodoj.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608358f94470c---79490880898.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/78700883022.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/zerofuxaminuzolimijap.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210702_818E179B9D634D76.pdfIn PDF document text
    • http://hueide.com/upload/files/mijavepatafaf.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062313143570554.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/bifipujozowifile.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1af4d68924---suzawikawukapex.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/duvajeferujega.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/11655426838.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/af4d78d917i3m261ktpfnphp18/5127611161.pdfIn PDF document text
    • http://maksimetall.ru/files/vogoxajerixapuxisa.pdfIn PDF document text
    • http://efrex.cz/files/file/66421578486.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/gunimoputovebole.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161198b9754d83---75278456666.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/1brqhku7ol3aq612jqsv4olrcs/74214335475.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607419ffe874a---41188259326.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/67388826900.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_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 11472 bytes
SHA-256: e669c5a947e4e59f0409c99536353816d257359aa8df1aa14ef1eda7055038d8
font_02_sfnt_off00013b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5A 18888 bytes
SHA-256: 8f47cc88ec0fedbef2959ccc1658cfc97c5f4ce33cebb255756db3174ef28dc5

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