Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6edff63486be2d…

MALICIOUS

PDF

89.0 KB Created: 2021-09-10 14:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee28a78ba6b172518a5127cecb913fd6 SHA-1: cee6712f5ea9bae10bbea340d3d0d83caa27edd2 SHA-256: 9a6edff63486be2d342efc0a924afe5680ebac6b6e92f040fa236e7f32b7f21e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://daaeportrett.no/upload/file/18068842656.pdf In PDF document text
    • http://paulgraphics.paulsfashion.in/files/45037464895.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/xuxun.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/meparifo.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/nelixojugubat.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/73170246841.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/68642292260.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/23637651101.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/vupipimekifuwo.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/79874555172.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2e6e89e10---25767633842.pdfIn PDF document text
    • https://visualarchive.bg/files/refuliw.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/76602358706.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/68607524672.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/bemudofarulimasuwubo.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/setanasepoluge.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/97195450717.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/fajumifafawa.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/33003427132.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/wojumiseluxe.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/25c6725aceb39990261b50106380ae9f/60710914508.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/37805670857.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137781aebffa---fazatawejesinadobosubiwo.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/33767829182.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jubebesezakimitumugugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=zepeto+mod+apk+unlimited+money+2021PDF 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_off0000db36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 18048 bytes
SHA-256: 572598f60e2092e052b773602296c4a635a757f0234acdc054724abfc45d3f09
font_02_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 10848 bytes
SHA-256: d434f55902a4053871164b27f98d60d3f3b6e74d216eb77e7ba80593fa808524
font_03_sfnt_off0001285b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285B 17468 bytes
SHA-256: 5bc370fd23e0e56ac16ee8d39de319afc1132d23214dac5afe3f82760084a60a

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