Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8056de597141b4…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 02:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9fe18f2656c61e6e2069ae55cb337a20 SHA-1: 6d35dd5326ea0495dfbff53cc6b80173412acd33 SHA-256: fd8056de597141b4b39d792f8fffb447fda179c40f7bcb91c3070053984a91a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing 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 users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fosterfreezesantarosa.com/uploads/files/kokunazudab.pdf In PDF document text
    • http://abwpetersburg.com/uploads/files/85398794670.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zobilasuduxapixodax.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/82847072798.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/rovuxowof.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d3e028635082e79c4a0a1e0d08b66f31/88037884836.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/43915604932.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/pabiwor.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/farazujebazufuxotibul.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/8804024791.pdfIn PDF document text
    • http://dfanchem.com/upload/files/mubiz.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b699daa3c6e6e1355eb0a27728e17b34/zevolido.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/bexogupazakot.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/13561216183.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/81438734280.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f39094da22---fefebemikatugoworob.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/61221245885.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/xewomijipudofisovenofisik.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/41044544797.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/nomuduzorig.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/getof.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/lavofuvuwoz.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/gibujujufezepa.pdfIn PDF document text
    • https://rotitelor.com/contents/files/xerivomediniduj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+set+hourly+reminder+on+androidPDF 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_off0000e54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10804 bytes
SHA-256: 5ab7b25923a469d486bc24d67dbbe24e1ce994767e55ef3393e69f843b8b9050
font_02_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 19664 bytes
SHA-256: ef29d33625af93a10c8fc0f2d92b3b49a4fe03f37a6c12a5d8d80c75a610290c

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