Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81c912db5ef2505…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 05:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c488dfc4af8e1f6a661e740b20e10dba SHA-1: fce9bbdcfbfae02e2ed249803fb06a6bcf60ff4d SHA-256: e81c912db5ef25054b3870abd352d3ec2030e5a8d782fd791c2c1ca4b17cf729
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF links on potentially compromised infrastructure reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/47803e3a177eaf6acfa4705b886c8f54/vozidiza.pdf In PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/badabutif.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6kjp9beeeoge6khro5dve1dqs/47728054667.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/64094592546.pdfIn PDF document text
    • https://ienter.bg/files/39706136219.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/mafax.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/up9hio3i3sro3boju3u87du6u0/94981144514.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e7pcf9ohe0i5e3nltb8mgsdksr/54710933569.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/de5fpqd429trp7b778mlolg0h0/xiroti.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/tatukubem.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/miuhs4ndi2hj1t9kveafc7ggk0/47973289428.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/0d486f89fc92532ed162e237925f46d6/mubijovatozatoreso.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c5cbe647---jegaduve.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/68137564489.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/rajuwa.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/xizalifibajubimi.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kizaxadito.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f7ad234ea7d214247f55769501c7f358/zomogolokejexi.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/vadesojolelarewawarerolev.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6jng0892vmm77771vh3c21kj66/44474299948.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/6a5ica741fkh1r7hn5longl998/67713000079.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725e49e98b0---bekefuge.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136649f74507---96755573424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tv+sony+bravia+55+manualPDF 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_off0000e42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 16440 bytes
SHA-256: 8c24a36309f28da67c3854e8d453802872a2bf9e8e8f42a6c88ad54ea798aa9d
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 10556 bytes
SHA-256: 71be1303359ddfa977ecb76cb6f1f7191d18a9b1c2da3b465887858e6f7c3e17