Malicious PDF — malware analysis report

Static analysis result for SHA-256 32576bd52b866e07…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 19:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6edf9c0c3f892b8fe9c513c26ce3a15 SHA-1: 4f8036cbc583fd9c68f3a97e2d249d2dc4055e9f SHA-256: 32576bd52b866e07a8598e1ac2400f0b3a6826d334759f8af65a3e688c950860
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to further malicious content. The document body is unreadable, but the heuristics and URL analysis confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089378fb85ca---26334410470.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff5c0e533ba---67098167620.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/mudopiperunojizak.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/26027474458.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f61b46d20a704da549fa10a356c295d1/49631321654.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ce5247c9---ponumorepifefowo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/7ju0djamfud8788jr8vua0ncbh/vawiresonosolorerafebuni.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/wajefimavogifukoduderoza.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a37dcaf39---bifekodisexen.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/bidarajiputerinizarupuxu.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/24851764221.pdfIn PDF document text
    • https://aneri12.cz/res/file/81301916338.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/66250840347.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/dogedilur.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1e85f877fc6d107c0f44ff352d660964/72029872099.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/98d0895dc81f7819f8cc6a1e228f7394/42160735736.pdfIn PDF document text
    • http://jaht.com/userfiles/file/saxadativi.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/72615865560.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/rimaruvele.pdfIn PDF document text
    • https://wecareprogram.org/images/file/fosubufovafelazagavufa.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/96617583167.pdfIn PDF document text
    • http://labotinnghia.com/img/files/28241833262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+does+the+yellow+triangle+on+my+dashboard+meanPDF 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 17124 bytes
SHA-256: f3b4b9748c42a6d85cca9bc085615e0cd1f8c1274ce70da348d38c591e82aa8b
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 11028 bytes
SHA-256: 2be75b6bb1b29915dfc3cb4749a5f647f8dfbd66aa8740a7dbcafaf9b61f1cf1
font_02_sfnt_off000126de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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