Malicious PDF — malware analysis report

Static analysis result for SHA-256 df328d3105ea4e91…

MALICIOUS

PDF

81.4 KB Created: 2021-09-24 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: f39f3c11516e56a3a581c80f04fed799 SHA-1: 012f6288c5de83d9d9889e4512ebf2be5ad796f8 SHA-256: df328d3105ea4e912698627cb1936ade8dd2aad94c0a3a0eb3036380af82e0e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and link farms hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics point to a lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=tab+s6+vs+ipad+air+2020 PDF link annotation
    • http://trieuduong.com/images/Download/tupubisuriludo.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/bejegolum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16142332a5aa9e---bewuninukoleralol.pdfIn PDF document text
    • http://kelvista.lt/images/files/xuruvuxalav.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/tidogeberov.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/nofiwojorisosuvip.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e4c40df14f28ebe083a5024bc6a500b/18069469383.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/dusopuji.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4dd944c02197944588a9e11cb8f5b25b/54397480445.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pisoxosoxip.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/1411033381.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e1fa69e7affbdecce86f3d9590c49294/52447825143.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/36784561041.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/18558103743.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/60292331730.pdfIn PDF document text
    • http://apart1day.ru/file/10551550556.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/57067416820.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/zuxusoxunisuvup.pdfIn PDF document text
    • https://noddy.nu/images/file/34080879510.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/releliju.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/48910961602.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/79613765282.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/84996422919.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/pavigagapumesi.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_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 10464 bytes
SHA-256: 9a013675b561e7cc074b5b647fa67394a8b4ba0f929c8f9cd1323f0704ccbca7
font_01_sfnt_off0000eca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B3 19780 bytes
SHA-256: 599c83b8e229b20070b01b9545c3ee3eec58f9d6ca00635d5b7e061a0810d2b3