Malicious PDF — malware analysis report

Static analysis result for SHA-256 434c140d78fb238e…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 12:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 589f36f5833bbd102c0864f1c436d9f1 SHA-1: eab9955dc0250b35f2c6ac4f0c8f9c195c2af9ab SHA-256: 434c140d78fb238e70c6a47aed89ccb2755f91bb2d9275f863fa5c572d8a8cc2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=limiting+reagents+and+percentage+yield+worksheet+answers PDF link annotation
    • http://inspiredindianfoundation.org/uploads/28901918595.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68489762617.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/dikawatakumavawavajuxobe.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d3df6f49c1a---kagurojazuzabig.pdfIn PDF document text
    • http://stasta.com/userfiles/file/59684952320.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fdc0bc980---61454479311.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/wumibu.pdfIn PDF document text
    • https://0900107678.com/upload/file/zoxikamowe.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/kudusefewawowuxodufavakuz.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/84bb7a01e199f4ea5b5ec86189ea2a3a/83866863456.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/xodopobim.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/36025824109.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b094f4e661---70199895243.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a25581c6b269534d60a6a219690ee936/47014492383.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pawozo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/xopezenikemetojafo.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/xaxugu.pdfIn PDF document text
    • http://zzweien.com/d/files/fezofapeban.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c30888dd7c41b3f680f50170b6f7ae06/1048103937.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe9aee857---27735913781.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3c4143c13---82249285254.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/xosowazurexuxozi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609caeff3fd70---79195093108.pdfIn PDF document text
    • 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_off0000dae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 11208 bytes
SHA-256: 76942f09cbe65c4d6b2b8fb972c48f67700eafa77bb8043528c259deec5b707a
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 17588 bytes
SHA-256: 2c5a47ca36e224ce0a7b098c0f61e7f521db85b39d0477b19699d62f7ca5767c

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