Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a86b06893ea1f5b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 04:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8593d62706af63b0a0c3e1afe23d4d9a SHA-1: f7160212ebc07876c1fe66d8a29fcc1e7ed527ed SHA-256: 6a86b06893ea1f5b3ce7b73bb3f20ea68e6f23aa9e192e051b80e17cd0d4db35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, which is not typical for legitimate documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=orchid+leaves+yellow+edges PDF link annotation
    • https://erdenet.mn/userfiles/file/63643117366.pdfIn PDF document text
    • https://ubranni.com/uploader/files/5125255492.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/k0vaq8h9rka14m63qabblm5ioh/nevumoruzogizak.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab3b9596a3---dozopale.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/53eef8120c25701752f93579a9c5f475/nupakam.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/425995a5f8b78bfa6a435b3fc6a5c346/2690127227.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/gotawipilewiwuxifipef.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/961b9feb98f362efc287620e316be91c/wivasimamelawa.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fozaliwujotiw.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a50f0cace0a---94820319137.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/61679546349.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a955a0fe---tezorevomapos.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiwizewupamekile.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/23909772407.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b09198d5e270d7eb89bc63bd1f4cf44b/81699696194.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/36ddab40b7da1e8da0086fff6dc7f805/jolamegefino.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/dikofazo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983935b0d45---29460667462.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/6002506174.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7d4028ee8---putatezafev.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wamaduji.pdfIn PDF document text
    • 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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 17320 bytes
SHA-256: 005b6df18538691c428a3d150a60af158145030540ed179ddd4f006f3306ca23
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10736 bytes
SHA-256: 3773081495738a827496007c5da4c3232369cd15fb2121d85b0ac42f1b539468
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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