Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb37771ac794c35…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 21:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 14c7290add8dc1dbf2f1e9429138e4eb SHA-1: 5a7de217f0718d2d6d86a184b5243537548c1f19 SHA-256: dcb37771ac794c3547e76a46de4d875ed36963847b4d681cc12dee45c1db3093
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 multiple distinct hosts, many of which are hosted on compromised CMS uploads or disposable domains, indicating an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://rayanchem.com/d/files/fefoxupazujofevitebi.pdf In PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nibovujideforuwor.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/mazevuvafu.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/dofaruxekuranugutibusej.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135494e3ed70---bewevegukuzagagevaveb.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16137e44907200---57111695196.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3e2bd3c7dce2a3733c0fd0b523fab82e/64580017207.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bavolijerirageteborajugag.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/8842180051.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/faee4688fb24e5e0d942e1d28f1926f9/lofabofebegorazasil.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/taridolagigituletuku.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/mozumubukorofogajavunit.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/pejefazasurubedovusisuk.pdfIn PDF document text
    • http://one9five.com/userfiles/files/romusonunexotidifesolovej.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/nolap.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/61582175155.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fazimepojosor.pdfIn PDF document text
    • https://insp.biz/img/file/subodixofujipivif.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e3a421d75374892928e5e9e017d6429a/zowapowulipolugeki.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/5939365114.pdfIn PDF document text
    • http://wernitznigg.at/files/16614196473.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/39019291681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+long+can+you+keep+chicken+frozen+in+freezerPDF 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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 10936 bytes
SHA-256: f4ef727c8b110c65a6327d734b857b15413e431733503d1907f1525abe08ca71
font_01_sfnt_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 15656 bytes
SHA-256: 278d3b6dab5bfa1b84327379b25e80aec6fb5ce3940937efca2c4393e97e0855

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