Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da0adbe8fca2b84…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 22:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a1ac8a289493c24677a53df7bab7f482 SHA-1: 865037d133bb5c884545645ad4fc30a0dfb8fd88 SHA-256: 8da0adbe8fca2b843540c7c7a6e0048defcc014c8483a5b76e3dba8a0a063d6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zlatartopalovic.rs//files/17215801195.pdf In PDF document text
    • http://travellightnepal.com/userfiles/file/49380103358.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/narari.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///58050692506.pdfIn PDF document text
    • http://groupkaishan.com/d/files/31656962491.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/21237227918.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc316d4ac2---22127467403.pdfIn PDF document text
    • https://kawanmto.com/contents//files/19241676644.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37c196997---xixolewawabimarapoki.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/13059838650.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3b64a484b6979f938c3e5d9c37e90a44/51468076328.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c066989c23e941c12508650f3551f745/9926153276.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/afhq7an7eemp3485qv7er3dub6/duwexafavebinadupoguti.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/mifexitonomeponij.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/69a5710d050e1f70e2fd4e32e18e518c/momad.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/9129117159.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/maziwedudapo.pdfIn PDF document text
    • http://orderkai.com/uploads/files/36136886653.pdfIn PDF document text
    • http://allycatering.com/userfiles/wopasolerubixodenes.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2aeabb5817e7d0d49a7f2c2a7587a0d5/gixofegukovobel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=non+conformance+report+pdfPDF 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_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 17596 bytes
SHA-256: 5edee8dfef4037a28ef1f45ce9d7883f1690ea5e421571970669609e1c1bbc45
font_01_sfnt_off000104b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCB 10452 bytes
SHA-256: 66d5ac0e5398d9c0adaabf66a8e04f5a34104bd24dae2830d03f1d9a5e4f6a8f

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