Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bf57717d0bf95e…

MALICIOUS

PDF

89.4 KB Created: 2021-09-19 03:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4174cd068a57a7d8083a8f95ebb00248 SHA-1: 52e386b784fb2286f56353d80545daa58acd1685 SHA-256: 37bf57717d0bf95e01e8a2828985e486ec629fa3fb3147706020207f87c28a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cructi.ru/uplcv?utm_term=recover+data+from+broken+android PDF link annotation
    • http://nprofit.hk/userfiles/kegidom.pdfIn PDF document text
    • http://gardatrans.com/content/Files/tawavuf.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/migilaropumew.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gatizukogasilezigi.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/dujuzowumuk.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/41779868338.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/32644546656.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/50171426501.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/72194900592.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/29114474503.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/sekatu.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613796e08b6c1---bewivukurakoli.pdfIn PDF document text
    • http://bociany.sk/media/file/lawikuxofivelidute.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6dfc40c5cdb8b94e8491485490000935/gixuwiwifamuxosagurilup.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/vusepuxesepisazatubigasar.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/niburirawalebixe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466a540dab6---siwakewakedumimunegojojax.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/20924439420.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/56856574284.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/wowelavuviboza.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_off0000f74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74F 18588 bytes
SHA-256: f2fe9e59ecae7bfb36017d081b692dd7323ef930f111c42fedb3b7fa6f6da0e0
font_01_sfnt_off0001274c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274C 10764 bytes
SHA-256: ba61c73ccf7ef27245d027727c8a6913158e9ac108b0f7649e0897466154835b
font_02_sfnt_off0001401a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1401A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1