Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4b8980a0e39a5d…

MALICIOUS

PDF

86.9 KB Created: 2021-07-09 13:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ace160f7d1c7d27d4aa97d446dd0323e SHA-1: e5a8b01d9ce8c6de68256229e38ea64c053f7dbe SHA-256: 8d4b8980a0e39a5dddb552c1d68052fa91d175966185e76589e52b9be55b506d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The embedded URLs, such as those found on '3dreamvr.com' and 'bowenpainter.com', are likely used to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/df2171b6e4c8c565e1e062d71814d661/67062149421.pdf In PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4afae7702a---77586318373.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/jupifomawisuv.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/9365427921.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d567f1a5097---noforitevejidojowo.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/wozekatogixulugoli.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/82775378721.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/vakebofesanadawudezis.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9ec60e5bed3ffd050eeb8fac6e249c87/rabimomekovivareforab.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aeb7976a6c276c91d1726a43f4fb2d18/80540960254.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/vesatuzibakokixa.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d22086eee---gemapodidisedere.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/12262852835.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f522c0e6---surawov.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210702200033_w440ji.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6ba6ee6b---89901857200.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/jolinetedolikaxarimumi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/lqac8qh711o39sq0bsapfhohrs/6799890264.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/kuramonabopidodu.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b861f18f6ef---59313066310.pdfIn PDF document text
    • http://coffee33.ru/archive/file/20525911020.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/45976697293.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/9691093945.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/800035413e6c1e2db5fe70b443def3cc/76595515213.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/libure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=firestick+remote+from+phonePDF 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_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10608 bytes
SHA-256: a25430c86cf9701d7ea3a90bbb244ea12f7768e83a04011f736aa492c59cb6b6
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17272 bytes
SHA-256: 9d6fd467aa557db990e0de63ab3cb33c3e1403a778df47241a3de3ce07aba5bd
font_02_sfnt_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1