Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6bf34d7c14a071…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 17:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b145bd02624b529ad6b66da8cb65ad63 SHA-1: b8ea0afce408622eebfff451bb33b1ec635c8050 SHA-256: de6bf34d7c14a0713b6bc934155f5a037ec71c88e2a8ffe53d86a3b5861b65e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious redirection pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=smart+launcher+old+version PDF link annotation
    • http://thietbiantoanttk.com/uploads/files/kadezalubozajabi.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/gikekuvugijosudonosimumu.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dokasixivevutotamijifo.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/21176273680.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/33408598931.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/16376214337.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/vaxexifogopovijorekepavo.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/40340225634.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/retosolizevidefubaborenov.pdfIn PDF document text
    • http://nineslash.com/user_file/file/32648211571.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/busitowa.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/3183188752.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109162146518084.pdfIn PDF document text
    • http://gespk.com/userfiles/file/kirija.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dc0b240f39d406275fa90fc2a2df2d6d/xanuvigebinusegufimorime.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1dfb26210---lomixoribezodonute.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/sekuwag.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/86084068808.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/66817499405.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/74466465671.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e19de47e60f72eac4fb508a103447e1a/3310829297.pdfIn PDF document text
    • http://rayer.cn/d/files/52613634848.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631106064.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/62829083116.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_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 18512 bytes
SHA-256: 76e5db912df8d67df0c2d84db03ed6110854f6e3d3033918d1e18667816bf970
font_01_sfnt_off00012aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA1 10876 bytes
SHA-256: d56c46574ece610fbf16b65068be5766936a7746c61804335affd91280a8f7b5
font_02_sfnt_off0001438d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1438D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1