Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a199128ac984b3…

MALICIOUS

PDF

77.1 KB Created: 2021-06-30 02:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 775eb5d5f4983938f7e238642e4c22bf SHA-1: 3a8e0a3b3485aa22e7b4f36da6ec9f6d8a218826 SHA-256: 56a199128ac984b35cd51ed5ce0b4f52a4ece5e7a1393097f254dd2102f0fc38
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607009941896e---guperu.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/98b956e9373fd9e4a1f4705e900cac91/96842438420.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/nibamib.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2bacbc5d---berosepago.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca56c1b3d---jopudodipazesufa.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f637db7---polidipiteseloxuwo.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076fc824d1d2---tegavu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0369e9ad75---21271769747.pdf
    • http://cn-polylysine.com/d/files/vozebuvifasiwekifi.pdf
    • http://www.aadhar-interior.com/userfiles/file/xojogokawubomujadebiredo.pdf
    • https://datajournonepal.org/files/basiwavidasuzivi.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/5528958123.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cf567b6ed---20777153728.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c8a84bb1---zuwukukixuboxekife.pdf
    • http://wisdomtours.net/upload/file/10333355737.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c07440d04b5---ligape.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a4adbee6---zezesitew.pdf
    • http://worthingtonpark101.com/userimages/vepinibi.pdf
    • https://ancoraeducacion.com/images/6511331159.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f1706d8d---filixe.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe4e3bab612eb397a2150355f08b429b/jidumawu.pdf
    • http://chickenwild.com/upload/contents/images/images/fazanevajofemugarate.pdf
    • http://savvyais.com/userfiles/file/16619361437.pdf
    • http://cukrarnakolbaba.eu/obrazky/files/25447548207.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sleep+apnea+and+swallowing+problems
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbe1.bin
dfb793e4956d167620496d667e77c62a604b887b40ead7612387429fded7a8b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 16316 bytes
font_01_sfnt_off0000f5fb.bin
4627e11bc040f755b39ef98a06599e1d6a7d431405a7d91074a3c2b2ac0fcfd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 10936 bytes
font_02_sfnt_off00010ee1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes