Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac40acf42049b8b5…

MALICIOUS

PDF

68.9 KB Created: 2021-06-08 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49e9658879e1afd0aed171f6cee4a83b SHA-1: caebf627571359499176a4a507bae614bb3c9973 SHA-256: ac40acf42049b8b5bd9041daeddc46fd50524d02cfd31b9f3f8149b827c9f01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=how+to+turn+gourmia+air+fryer+off
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/t1qdr10j3g00j2g9ica2vmagls/17898640838.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc25200edc---podexolu.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a65f10bf041---45218962935.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e6o9e6e8pfop1o186jktghh76s/kovubaz.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/953ab3844e6c7a872cfb6690faddbc55/53325056567.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/chherl4l13p90bjk7uu4dn3pv0/64553285613.pdf
    • http://curry-box-deluxe.de/userfiles/file/sexedijere.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4626898e62b760e158347c95eae9de21/tuvijetu.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2030eeb07---vugamomepakaliwareluvil.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93dadd7e3---tabes.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4aa9u5m17vnqllbvrvdbdr3ns4/63259367910.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/pejite.pdf
    • http://3bbb.fr/ckeditor/upload/files/46126429132.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087824ae756a---42736405984.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d291.bin
23665d4fd6a51512d56087c83657468ebe68e70539a087f2e92aceafee1c7f9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 5032 bytes
font_01_sfnt_off0000e3b6.bin
c363e4805f1bbfbf6380510655a180b418e3b09b9a0b29f7e674c70667229f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 10080 bytes

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