Malicious PDF — malware analysis report

Static analysis result for SHA-256 c295e216c4dd5bbe…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 12:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bc74f136e32f5f2e1db74f768de2671 SHA-1: 7f0f7cd1dc6511a02d4f25fde9ddfc2a4ee8e431 SHA-256: c295e216c4dd5bbee854a6f6a26444a06ec91be1b9298136f595aabda3a1966d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. Heuristics suggest this is a phishing or malware distribution lure, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=gta+apk+sa PDF link annotation
    • http://vallovin.it/userfiles/files/85404244664.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t1741fbeppta536rhpp8ntena4/56554168993.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/34818702468.pdfIn PDF document text
    • http://imi.vc/upload/files/36000584929.pdfIn PDF document text
    • http://bwc.lt/i/zijovemugopexeliw.pdfIn PDF document text
    • http://dges.in/userfiles/file/kipusalorupimaxuxemudasib.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/855979212.pdfIn PDF document text
    • http://195exim.com/datas/files/vemawanelitizigonezo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139622ce3d5d---80328263931.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161418c29a2282---goxenojotur.pdfIn PDF document text
    • http://jar-ted.pl/file/kozek.pdfIn PDF document text
    • https://valuekare.com/ckfinder/userfiles/files/45371161843.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/26105037409.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/pibojogizapesotosipefudip.pdfIn PDF document text
    • http://prograsifkalip.com/files/xusobenigu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/mevesijafe.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/44894154140.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/82041020853.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/dugukilagubixopu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/jupirukisovadev.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614228c7cec7b---57389817397.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/banefijisarerapejida.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/5089020578.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/jevobefubamejamizaziduvur.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/bubope.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_off0000b051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB051 15856 bytes
SHA-256: 10f845897c460c1d80bd86bc59b719e39d0e762e683dbe4ffc9951a66549fc18
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 9784 bytes
SHA-256: 007e1b3a68bffcd59b9196e407eb90bfc743b0e72ace47aa63cb74900885b0e5
font_02_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1