Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af7864d9455e8f3…

MALICIOUS

PDF

98.5 KB Created: 2021-08-01 01:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 10604b03bf3d2057b9970c08f1485e4a SHA-1: 8fecd52b5f8516d053cd91207100175e5421d27c SHA-256: 5af7864d9455e8f320a5e59d39e9fd2b9dad5c926098fb8a14432b367755e9b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/88122168899.pdf In PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/r1q0irer8idtqbmd8hejrvlseg/31022846068.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccd91dc88---42902994946.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/38185558826.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/uvfs766hhcivs8a6ntmomi9qc7/7951154418.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8d9351a86a7ec1e5caf8b16db1d040ad/zilezepaxetar.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/61667379026.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/zumamanubonato.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2ccf28ba9ed5f96f77779c36c288e59c/44628076163.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/ea2912f319ce214eda153698cce1c058/84886052715.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3131f3c8ff---jiwupejujazetajopatis.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/762921535.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/gigarexijotidix.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/rojido.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7b0cipnub08aolt91r7ist98mk/mixomekunomosudaw.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/d4e567336f8ebf1109a9017b77bd35b1/13959688811.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a929be746dd8c289e956b1e7e1138076/ronekidufarujafotap.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/wanulijedotekalikezutu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/92dac2a6cc2268f7b168f7571df41543/74918540362.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zitikujataxulobumepen.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16105cd02412ef---pisokivoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=laplace+%C3%B6rnek+soru+%C3%A7%C3%B6z%C3%BCmleriPDF 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_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11252 bytes
SHA-256: a3075116506c73c784bbd5a28ca2a2cb0d051fbadc1ef2c122063378fd611b7a
font_01_sfnt_off00012ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED5 20316 bytes
SHA-256: 2640c7cf84b87fe67eee66a69bdc36254bf9b819ef546f69ceaaa17d422327ef
font_02_sfnt_off0001618d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1618D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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