Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d95aca7e0ae204…

MALICIOUS

PDF

96.5 KB Created: 2021-09-01 14:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d66195b3fdc454ebafb724131201e97b SHA-1: 878c4bb79e826d93448056209721d935e4e3b143 SHA-256: 06d95aca7e0ae20494325b043d3732e54aebc60faaae04e51f59bfbb991e9a04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://flairpens.ru/uploads/files/netinudorimawinabumixo.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4b66207a90e0186ad7f9b4c71141de06/34884820988.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/mubizegel.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/5253382875.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gadanutajexolefetiganot.pdfIn PDF document text
    • https://led7.ru/file/7035953093.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/32572925263.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/miripa.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/879196de3804d368fcc06ba2cb6b0836/vifupogevifu.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/wezili.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082603c62add---jepunukumipinona.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kj6h5eqahdfvp9r7obfrq3o2f1/fupigakaj.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/74321114407.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/94196718189.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/so82mbj9f75bm2b1hh3opreha2/zozomixamapujevigomumepo.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/hdqpihilspp4suqqlpkncg78oo/22956558340.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/xetupupoxumew.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/jadidorituteniwolewenebir.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c52b47128---tirejewujakovule.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080615ff21f2---mugizanajesurujeduj.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/pazurogem.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/48629824448.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/zukudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cambridge+english+pronouncing+dictionary+18th+edition+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_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 19880 bytes
SHA-256: ef271d32d41c76a800f3d74021d0f9842d211fdcf10db49c7156e5fe281fd2db
font_01_sfnt_off00013fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 11712 bytes
SHA-256: 1f6a696de0b52e01729d2995e07949636617097dfe2a36131d16f624585e8d8c
font_02_sfnt_off00015b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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