Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63c7ce9f011f487…

MALICIOUS

PDF

83.8 KB Created: 2021-08-17 05:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f9ecb7e48de5c1b8d6639132c7c3a7c SHA-1: c43ed9494aa7bd44f2a40bac338abbb78cabeb88 SHA-256: b63c7ce9f011f4877107740b2fa5b764e2490bc2903d3cf96e5d262a777f211c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the true destination. The embedded URLs and the overall structure suggest a phishing or redirection attack aimed at tricking users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/chnhi7cv9bsfqsm5ielf067uv4/91585107929.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecdb77553e---xipafokuzozo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/dawim.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/pugotetena.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/0166c7c72e11cbae5d647f2a974c2fe3/68767608242.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/xajinorifitefevobiwidexo.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/kofilakomovadured.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608520d7788bc---44576393984.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/62926420746.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071736a8cc4f---31035708431.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eab8e7577---64557219104.pdfIn PDF document text
    • https://vijyaiprismcrm.com/userfiles/files/20817817534.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/209bae2febac334fc07cc8953c61706e/22788613122.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/17sjfmd1k42to34a30ud58c7v3/dovofovawifo.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/45671395753.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45d6120a84---7698259797.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/84464553552.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/pawizubixotalesaleline.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/rekimubozunirorelepazodu.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/47980254783.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606efffc1acd1---mawuniwomusokikewek.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/79352831101.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/gebazun.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/818dc734607d84d74129e21da1c838b4/98494334701.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52298678961.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jafezabujodikekovuwemefu.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/onq7vsckgl8uedgc687mvfmrna/81060184364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cool+drawing+games+unblockedPDF 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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 11064 bytes
SHA-256: b6f47a4dd100dfb63f4d046d632672f2dc7350ac26c8a9491b181061cc2d9dbb
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11503 16968 bytes
SHA-256: 66a88381a2e12964fb23c9f1942e7e0e38689f32743a7917f91a4310914e50b6