Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d2236b03f927c33…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 04:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a60e4f8baeae608e47c80484b24b43de SHA-1: 77b75fec299aee8d2ff0df752f8a9b2c5ccb7a87 SHA-256: 8d2236b03f927c33fbf693f6950b02983b82f9436f9ebf1ac0440e57ceda39ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to host links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=list+of+new+cpt+codes+for+2018+pdf PDF link annotation
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c934e81c2d---dirivufolisiwomazobifif.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/bepomotov.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/tenakokufifewagoraxuxu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/mudevarebirerununifa.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/30218999868.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/90560618222.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/79867765010.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/4md88acq3jevl8rftbh34vd11k/lifaxefegavadedu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6b12c2652f68b9245237dc4a15544764/kofilobepibobadexevukuk.pdfIn PDF document text
    • http://cortabellanews.com/userimages/lojujezobujedavug.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011121101348.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/1l9p3lge372tq9rt4ji7c6eotv/13352282141.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/juzugetefazafofajir.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/mujikatilarelemedavida.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160845d9a1592a---debixupafazukazetolaba.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/dotesogopojazerexo.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/36036903827.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608255e035b05---12993687840.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f4eec60ed36---3712015984.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d60b2a491---pupefuwosikomu.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/sivap.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/favukid.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/jubodevi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa0b36a144---7771722000.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/406e10bb2c150718535d72de6c159a83/36333835854.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10948 bytes
SHA-256: 2d1e0625a56a4d7b153d1f3940b13af82f135f27e737733a9fd66414b04e69ce
font_01_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 17968 bytes
SHA-256: f2b12c946db19e018d709a753ebab837d99a05249593223573e59ba0cd5e0f71
font_02_sfnt_off00012473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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