Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c57432a106ead…

MALICIOUS

PDF

72.3 KB Created: 2021-09-01 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db7a03ab35f5438171be7903fe204984 SHA-1: 875caf79966dd01604b2d1ae155ba20b32e426b2 SHA-256: 4f6c57432a106ead9ea27efbc88583c16db2f4f850326b70ba3398beed2d454e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=convert+character+to+numeric PDF link annotation
    • http://africanhairbraidingsalon.com/userfiles/file/82901668840.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7518bd4f---wasotinigovelobixisufavop.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/71761714700.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/puzevukobojebemoveluxo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/53e91e1c8757e6a2d013a622d5eb63c8/wurupipadalu.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/61816901873.pdfIn PDF document text
    • https://alutat.com/data/file/poparegemolop.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/bc662e315922e1ac00e64482487062cf/36060809245.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114cb5e8805d---rakuzemidabawumimi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/pefemakodasar.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/68370220586.pdfIn PDF document text
    • http://moristas.com/userfiles/files/merizolusazateverarivexe.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210810030027.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/80944044744.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/24768978072.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/naramudoleb.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/43857234010.pdfIn PDF document text
    • http://fotossc.pl/_files/file/89508685236.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b5501c4ebec6389be77f00b2949850d0/tovomepivodoxuzewazuxaxa.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/pivavivesusevajugosa.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/12848405742.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c49f8ab71c1---85487159926.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6395440fca---fexiwerofirijesokik.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/55231641925.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/wituxenegeposegizegonegab.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/60287135686.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_off0000bd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56B 10476 bytes
SHA-256: 521e320df63cb124d4440b98641390644fb4cd7c7a0fa1c4b260a311b573e21c
font_02_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 14340 bytes
SHA-256: 8902b59c05bc28e2242f545a5adfc7b1cf27cd0e3ec9b9373ab309cb2085bc91