Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86b4e729c387b76…

MALICIOUS

PDF

77.2 KB Created: 2021-10-09 01:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ea45b180742cddca8f4374725e185209 SHA-1: 1747713392640778788fc19d1c58650b5d2f469e SHA-256: a86b4e729c387b767e8506cafdbe396e1ef55d2b70d408d548f8b7a77c0fe50b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns that leverage link farms to redirect users. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=common+factors+of+28+and+42 PDF link annotation
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/9957191636.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/givilavapolavi.pdfIn PDF document text
    • https://onderhoudnlgarantie.nl/upload/file/kaximelesiwevemixefe.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/16535791563.pdfIn PDF document text
    • https://el-tall.pl/pics/file/josanezi.pdfIn PDF document text
    • http://bluebossa.pl/files/file/guvepega.pdfIn PDF document text
    • https://protum.se/file/suvesopigavovubisaxe.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/nuvezojikadomiwirifofivaz.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/tomoloduzubikade.pdfIn PDF document text
    • https://airshow-bg.com/file/76725619866.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/84c70fa8938dc20033d4cbfd8ca2b76c/dowazikemefavemojima.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161464469d2c83---pafujofesuwubozegusifoxo.pdfIn PDF document text
    • http://life-homeshop.buyout8.com/asset/uploads/files/tokedunujeb.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161312b6b3a4bd---dogenotewon.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/vulevafodoxutikejonusunus.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140343114025---tigamojeja.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/8945906489.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/35073877555.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/8296701893.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/werovopezusevobero.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/89112140021.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913020110.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vovevurozesefivibidotako.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/zosabobu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be844e94e9---93045460957.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/81078013457.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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 10804 bytes
SHA-256: fb66a3a96cd0d260b71e283a5dc5721a98c4a26a16af30447b0e823a607fae58
font_02_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 17824 bytes
SHA-256: 224250bef7d57d4c098b99ba7a6f38d6bb34a5d443540684d33d002dffc19fde

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