Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b1f1d0d39c94dd…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 00:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4dc5801670afb411ba61690052713576 SHA-1: 8ec58bb955e13720efd703a71afeb114d5b524d8 SHA-256: 76b1f1d0d39c94dd287f6ba3e82cc0f9989052dacbe4c79b9dcfda27236313ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating a phishing or trojanized PDF. It contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates an intent to execute code, likely to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://travelinnsuites.com/nbloom/fckuploads/file/retogesilitozosug.pdf In PDF document text
    • https://robertbah.si/files/file/kofuwadumosuvebobufavu.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/2252427861.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36154cb1cf---xojuzalidovuvo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66581f1804---vodaxedevilix.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/170460581.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/neguwajemigis.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/vowadusijo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/jupapilakivovifofo.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/fodotuvaletonemekotuzij.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/80025981690.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/11818965179.pdfIn PDF document text
    • http://hasyo.net/files/file/64129494850.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa139f461f0---tarizamid.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/diwuxomizetiwasirazegupo.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e505f44---wiser.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/liwexunanafeso.pdfIn PDF document text
    • https://olterus.net/contents//files/mezitixotogaxezu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098606b34562---98071355834.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/45926099751.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/tuwodigiwibudirigad.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d5c685290---11657990366.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108111201504131.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nexivojowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wing+chun+martial+arts+principles+%26+techniques+pdfPDF 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_off0000bb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6A 20064 bytes
SHA-256: 78adb17fd58add92060fb97e71dd3f4b59f54ef0fdbdc19411bbf16da45b6a1c
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 10792 bytes
SHA-256: 0f22dbb6f4782c8d611d6d4ca508fac9f664314bdc635a6410674e02653b8e62

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