Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b7bb707f55467c…

MALICIOUS

PDF

82.4 KB Created: 2021-08-21 11:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5f90e617cffc0c7a933f98a21bbef05a SHA-1: bf89be3c479da5cdd9751e790c97fe5657c67784 SHA-256: 09b7bb707f55467cc654f8e0cc84fc237cd12be452f40be36404f4ce57d570c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF's structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=how+to+install+wwe+2k20+on+android PDF link annotation
    • http://jump360.co/upload/files/20210615144602.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/7ef7b32e77f3ed3804c488349766dbc0/jezokixudema.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2685cc757---95838993427.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/170ca018d0aefd509ae0f0ac2c98fdda/4037533525.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/likivebasigudu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e5ffef1e865---xedezopegibavibipuxixarij.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/31292860682.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/33773475951.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a41add17726---silataxuxemas.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d92ecd9b090---85084226681.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b7fe6df28d63f9e176e822be7a3aa75a/16495979463.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8546f1770---82786884979.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/56240372223.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/xalujirarefo.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/41033976410.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/xamejijudumapatuvuko.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607065145ec19---kimeg.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/bavebamuwoxipiji.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cee1bac5ded8e775565f1c3698a9e345/bapojomif.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/pikebunozugoxuzutexopak.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/zogugazetijififetusa.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d3853f0e---28279279916.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ab0e2262---27125129741.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160978df3cf473---16713820914.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/19080266547.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 10652 bytes
SHA-256: a5a0fe82a72b298c7a3f60adc9c7382c26dce57a32db7986b343511b195a0a4a
font_01_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 17116 bytes
SHA-256: 05467c1bdfa6ec35ce7eded39a0044e88d6f65d52bbb8138c2ec7fb8002e4997
font_02_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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