Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b0d285a5b489d5…

MALICIOUS

PDF

74.9 KB Created: 2021-08-17 15:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 46b47b11eabda829b7119861befee64f SHA-1: d986c5df5e338e3ae75fdedf583a296aeb63786b SHA-256: 76b0d285a5b489d5bbfe285f2807ea983784e2e55016fd9571a81fa67f8ecee9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute traffic to potentially malicious sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://laweasy.kr/userfiles/file/tipibidobosugoririzikokem.pdf In PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9b3e37963cb2f6e77e83d33d31767c88/zofafivorezujadewujuk.pdfIn PDF document text
    • http://dnepropress.net/files/file/kimoso.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/zepanekezomipirom.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5448b01af0---37033237677.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/88a7523b4d27339e1ba929a7207222c5/70486273094.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074641fcfe28---zuvijib.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/vavexusofurosipalivanenim.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/96100435601.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/4896947200.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1bf2c9c2---15987892378.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8af4b45a4---nakenifepebalukas.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/mibomupobinuw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087192321553---rumimeduxojaginug.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906f3962734---64592260340.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/sedabepidilel.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/76000173783.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zijubanopinupadi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/temojiredilifudopimeza.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xobuwisewokot.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210629_5B00081C6D3AC685.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/52052667764.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/97444656047.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/xedubenavikovalediwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+maze+runner+tamil+dubbed+movie+download+in+tamilrockersPDF 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_off0000bec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC4 16324 bytes
SHA-256: 26e2f89f691ac4d7a0d55b4d3a6d75865fffe9e1ca21bb8f0aface8b57a6c3b2
font_01_sfnt_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 11144 bytes
SHA-256: da94bae67f6950935ac5d421bbf5d856cd13e88fe0c7af38c80ea0b89731e06c

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