Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd21348184b9513…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 14:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a66a4463bf5b9cff54cf9272bba755a0 SHA-1: c036afcffbd261ea2745d614086917c82f8bf528 SHA-256: acd21348184b9513bfc330206948925b09cb888c8c053830e669886aa4ac7e19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thaiahpa.com/flash/files/46360358218.pdf In PDF document text
    • http://garderoba.sk/images/_file/79232587743.pdfIn PDF document text
    • https://simorgh.it/uploads/file/duwasuzi.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/labowatiledugupa.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/wigonobelo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f10656e68---xurubesari.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/debifomawujulexusawadobo.pdfIn PDF document text
    • http://trubaopt.ru/content/file/terunabosariregami.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/40852821278.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/woxovopakotuzudarerola.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vpb94qk84jujnljnls2ce13pf9/nofidogozemidaditugodobe.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a873b841ab---86787883416.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/najejinedosof.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/66068306196.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/domiwuw.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/65195700261.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9794d9eb5---tavone.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/98524351888.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/7695724341.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/85643255976.pdfIn PDF document text
    • http://wawa757.com/uploads/files/44806734930.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/tisefatuwijageze.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/zuxodosugojaferekiregesa.pdfIn PDF document text
    • http://workontext.ru/media/file/16770539714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+watched+for+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_off0000b065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 14768 bytes
SHA-256: f5506a39acb4181ddc9050d27afcde517e6fbba53fd5e9f5dca03b3139eb072a
font_02_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 10492 bytes
SHA-256: 7914be35471c850a11e10882bf11216ee307a0bcd78b726f87eff2f603009584

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