Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e6686b5659083b…

MALICIOUS

PDF

106.6 KB Created: 2021-07-21 18:38:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 62db907c2018bac5d13457544ee615a2 SHA-1: cf86480c71b73a15abc95d318f703e7509c3b278 SHA-256: a2e6686b5659083b9515c5abbc4cda4e6f3988bdb9f4c33120f87bc5f81b0f06
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, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing content or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0a862dc07ab0a1357982fd22a3426850/70222403186.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c01d82ac5c8---21386723191.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/gomelefo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ccc6520fed99a55cbf65f4ee96e4d8a1/megiwamasotusogibaka.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/4ad92f6a6e9abba514682ae14d7628b9/puxipejifoxan.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/55156076129.pdfIn PDF document text
    • https://hcviet.com/img-phuctri/files/48095511409.pdfIn PDF document text
    • http://darec.sk/files/files/barinako.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c11c5ed95---57104026977.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3181e74745e361858b6fa07c5a1ec943/nimivupabusujokuwafagi.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/xudada.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/32516758927.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077367fbdc62---wozujesabejedarajo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1kgm7dgfuuk5us6j59enl5i0lu/60366393390.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gusipalorezimuwibanubup.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/5233793242.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/0es72n4tdaei1nfpnd8c8huj13/govitegivixulimufevivopo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59ae4cb8e5---mowarunatozaxu.pdfIn PDF document text
    • https://nadamasristorante.it/file/4863108581.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/25178842974.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d5df2cc32---42276064251.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a0176ff1b25---wegufogafejulitofinef.pdfIn PDF document text
    • https://togeltop.net/contents//files/64484043749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fever+lasting+7+days+in+adultsPDF 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_off00013e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15618 17448 bytes
SHA-256: e60d59ede69d1320833baaa804aaba943a8ed61f10069283c90fb39405dad035
font_02_sfnt_off00018338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18338 10608 bytes
SHA-256: d6561147d2f4c1ba131d829ead59a9d5b767db9ef85809185265e58a4a9c9128

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