Malicious PDF — malware analysis report

Static analysis result for SHA-256 8282b02e7cb36409…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 13:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ddd2c6e3dea19993567d4745cd2c35a SHA-1: 53dc6fbe637cc53858633d9ddf7125d195dad548 SHA-256: 8282b02e7cb36409078854b5f28eba6e6c14e2c9d2234df26e461539c7cd29e8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised WordPress sites, indicating a link farm or redirector pattern. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://laborke.ru/uplcv?utm_term=youtube+app+latest+version PDF link annotation
    • http://vncdata.net/app/webroot/uploads/files/8053618012.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/20464941849.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/zonedewurasopefamatemen.pdfIn PDF document text
    • http://live-net.it/file/dolugunogudamedowebarub.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d7387c739b3607bb19772e468b8ec278/45475617062.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/83107441464.pdfIn PDF document text
    • https://anakmeong.com/contents/files/fenulijop.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/paxelidolil.pdfIn PDF document text
    • http://goldenmallbiotech.com/upload/files/36526820760.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/fawosekowirepakixedu.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/givaxilusobekezan.pdfIn PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/nidiwufigirujurumupotovat.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134219445479---24128346518.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/55518548801.pdfIn PDF document text
    • http://www.polni.si/Images/files/69815562106.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/39508757319.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/50796438332.pdfIn PDF document text
    • http://matras-devison.com/upload/file/50651757460.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1b4258719bf653805b10ec8003d4c1f3/kopukudebaniborowigiginos.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ee6b27bec548d6d8d4422de75ebb4147/wijunolosuxi.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/54991426861.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/zejunasoxipiku.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/wejixovujamawomabosif.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613718ee92f90---26755091538.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/bezojexetagumibejoxaxegek.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/60254718152.pdfIn PDF document text
    • http://wmsone.com/eimages/file/44348280070.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_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A9 10536 bytes
SHA-256: cada447cc9d32f37d60d03754a3fa8529d94f00b763e158f46949841b205ea80
font_02_sfnt_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 18200 bytes
SHA-256: 4fae66fb15fd89ab909ac9d79afee14cf2bb79e8da482791cf716fc1eca0dd7a

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