Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb64a0fd5621ee8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 04:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48ef5df25edb30c6e2da99e460e1d511 SHA-1: 4ac1e2a2247e520b4d1e904903b42cc05185ae5d SHA-256: dfb64a0fd5621ee8c485aa59496cf659063e9f004fdf27136f33d0d13bf60b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to phishing or malware distribution sites. The presence of external URI heuristics and link farm indicators strongly supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=plus+one+text+book+2020 PDF link annotation
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7051cdbb067df2e890c0b0db13a2d7f1/kenoxawetogegikolesow.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ce538774de19915ccfd826979a34b495/xapavajuwekusaferul.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/tizuxowipugo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/dujipi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/586a5e38801fec520d0182e0455eca2e/nedizisodesas.pdfIn PDF document text
    • http://fotossc.pl/_files/file/29732314543.pdfIn PDF document text
    • http://m2m2design.com/userfiles/89180968454.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/gupapife.pdfIn PDF document text
    • http://aimic.com/userfiles/file/49085494814.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/wazupajoxu.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/g3b5fvl4entha19m8c642vn097/4812263365.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/f8r378r55hlmnloro7ed2hkdrc/43917412708.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4d928a18b---46665301519.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/karuxiwavewop.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e98ab482bd---57964328511.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/natorurudazupirapidiro.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ziwovulinejixifonukubor.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890f0db3a70---xebatusuzupifefazojupener.pdfIn PDF document text
    • http://asustainable.com/global/file/mobaxegamilunilasekofu.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/pobefijokubedulobuza.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982559b7761---25277548172.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/25650637795.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rokabifexubexuj.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_off0000e3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CD 17516 bytes
SHA-256: 1a17b88d33e79ade2578d88f84e4ce3f2c04defc3f7f0ce459cc329bb20cced0
font_01_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10424 bytes
SHA-256: 57b4f6f84785489ec20288710b3463b0b6f38ce525ad2ee707eebc92e011b53a
font_02_sfnt_off0001291c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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