Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d7a790a635071e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 02:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ca62b17295164545ab910d5f4ab0ea4 SHA-1: 489af286f5d0cfd57ab66deb9eb2f12fb792b940 SHA-256: a8d7a790a635071e189e35bf6cde22d6d17f311fc64288dc392437d319fb0462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous external URIs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the ultimate destination and potentially track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=how+to+mod+ps3+super+slim PDF link annotation
    • https://autosaloncenter.com/uploads/file/xupowuxibimelebidep.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/ht7jjnvcmmjflnjthdfoupb9sd/xefoxodibot.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/798ggd1sogl7qpoacop63ikcn4/gugazefabilixasukigepubof.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/dimujitivurazoje.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/nenodezoguzoridile.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/55486482653.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/21848540704.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/vubudodunubomuwoxelis.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/nimojebavotasabobajuzobu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/79a26106244f727200f8a8576d971978/jijaget.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/palimumewejavupetukisizi.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/60116239368.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/kufezalutibuburo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90e5b74b3a---95939194158.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/mogusafenegotewanigometo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e8jvknst6a4slekq0f0ola02e0/wigafanuk.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/e6b3c98cb67557e187ce1999fc5a5842/48580547443.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/eba3eca5e56a55f8d21b8bd0c1f77c59/jovuvovitumenulozolejidav.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/rotunegereju.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa97eda6734---81697397194.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/80841663410.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/iihdo82l2i958l4tar8nj6o3fe/40320679845.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/nexibajotiwijoluga.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2ed56b0239cffdb0179c2b9d2c15e43b/xuwowadeg.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_off0000c1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 15928 bytes
SHA-256: 335d3c7d3f7aff1ee850f2b1324583f910e6b8f954ad6f1ca461368252724a4e
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 10636 bytes
SHA-256: 256b2d2ef9c3381bc422e755453bb292d7ea519c136395de59254fbf180c9524

Open this report in the interactive analyzer, or submit your own file for analysis.