Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7b3a88d87fdd5f…

MALICIOUS

PDF

91.2 KB Created: 2021-06-30 02:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ebc5bc2b0515c50bf46c280114d3e3c SHA-1: 9c1670107672c6a1cc908d65e38794e9986764e2 SHA-256: 9d7b3a88d87fdd5f2d35b4a3a5a71db3091f65469316e7160bbc2587375a2ec0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine rankings or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://sushikyototogo.com/uploads/files/luwagatezaxar.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6840374c8d593d52aef9a231942c9e6c/tobuzusibefir.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kadalidi.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/55843df1051e6439af392f2e2fd8af60/62339443757.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/41384248387.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8bf308a59a8c6b6b436dfd0d729bbe7b/90953660253.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/xepugu.pdfIn PDF document text
    • http://apsons.eu/files/file/20166144068.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/pixijog.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d48062b3336a144d7008a7753bd1f804/9860088067.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ce1b4056a973e8f6e752e3d0ea3c675b/tubefilezunimesikevob.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/witenavuxewumotorol.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lunironavuz.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/gutas.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced0113ac5---60918077217.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7e9ce585b2032d161c506fe12a55ea7f/ragekemavanik.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b55bd7d4b---64552931584.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74910ba40---ponilojogaju.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/kovizesim.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/a873ba2133c70ddcee24d9b2f5cbc2c3/gekejigori.pdfIn PDF document text
    • http://esejsc.com/upload/files/8044997710.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/tuzujapinubuvexupaf.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f5908e375---junakizale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=best+anime+like+one+punch+manPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 2120 bytes
SHA-256: 3b81854c21305b65439b8246630bfb9f2d6ebfc9380e9843c1aa35783242039d
font_01_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 16948 bytes
SHA-256: a48f230904326fe21e2cf2c6e2a8928d847b3ddce92db195e9b69a58e9293da7
font_03_sfnt_off00014671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14671 10784 bytes
SHA-256: 5101d179013c703ebef11c6ea8e4a2c90e283664df0aff58a280b6408cd04eb0

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