Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbb725278503bce…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 19:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d75ff98ab71ccdd4d55022fed0c41a03 SHA-1: e61590c0bd7e4d9d193363f214e368865dfafbee SHA-256: 9dbb725278503bceaf90edf8cd960aad15d9b14777a162ccdbc046793cffc4bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'Download' button lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mamotato.ro/userfiles/file/48417394687.pdf In PDF document text
    • https://mangonebike.com/uploads/file/begiro.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/visikew.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/wivifuramotinelixabujama.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/xaxikexikujawotuwemaxepuw.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8d3d09a137b0ffe7676e2b73a20f88b3/xegirigavamebubipag.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/mixesiru.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/42300120568.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b321b9ce9de---xipumigi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162735920796263925868.pdfIn PDF document text
    • http://otczenacts.com/media/files/bugusokipenuzegobefi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/maxajab.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/60864330930.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/16269107379.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a8077d2e2e62e3e6b97b20e6247b4622/gabalesesikivelen.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/rikosarame.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd505cf29---97301120971.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc8f4a3114c01d078a09900d12f12123/xoronutupunanibapafajinuk.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c46721c7c0c1b3a22bc0930c0e1ba5ee/61196245282.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/wazuxewimuva.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/16080323702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=encyclopaedia+of+chess+openings+pdf+downloadPDF link annotation
    • 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_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 10884 bytes
SHA-256: a819a8600ec3335e224f6a39134471bbb14a41172c7a639249e78db0c4fcb74b
font_01_sfnt_off0000fa39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 17972 bytes
SHA-256: bfb9463aef1dea959bbfa07c4128e282f4aa94dd102963aa8b96d4166e98e33d

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