Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac6a783760638e6…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 06:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11b0a2fe63812d6b052552408c00cf71 SHA-1: 4582bdbb0740a17373f34320386f304d9836505b SHA-256: 0ac6a783760638e6c8673e22b01e8a693899ed1a0a7c904b014aadd3e6574c0a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. These URLs likely serve as landing pages for phishing attempts or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=happymod+pro+download PDF link annotation
    • https://protectname.xyz/whoisprivacy/userfiles/files/vavapobupenilanoxuvolak.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c28421b8a2ab1269b364be4a46d36368/60106589488.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8e76ce19fc7e810635479c6db8ef2c5b/14828198788.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/zowogalezufizufowufizipa.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/67f48f96244c2092d12f673d3818421a/jilevuwokugugeruzup.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/62463942207.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/detevutululenewowixoki.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/sobaxavixi.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/xizarisowesevetosupopol.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_141534.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15710980456.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/zeforovubokiliturunowar.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/gesemamumezopafewikow.pdfIn PDF document text
    • https://pecsikult.hu/files/file/pazafuripiguv.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_015938.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/72903156078.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/48167787871.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/90669543553.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/42708908298.pdfIn PDF document text
    • http://xfswchem.com/upload/files/84335665718.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/2254495656.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/tuzaraxademego.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/210907080835175700a8cex5.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4vbm929fj6eji7iv8vdpm81u2m/81434102413.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_off0000bd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD02 17276 bytes
SHA-256: 7d495a88d07a3c8a577a3d4230904b1d10875932c71c657d9e5c9ef3cde82c78
font_01_sfnt_off0000e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 10252 bytes
SHA-256: 9ae4538d9df6742b2d32cb6882c765af375e4e7bb7c159d48695aec066d7b24f
font_02_sfnt_off0001003f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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