Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f2029cdd03768…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 12:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e8b0493113e92cf26e4ee663ccfd4135 SHA-1: 0f6f6ecc8a6bd83b592d31919a94f68f36a6e24e SHA-256: c25f2029cdd037682f4627e20abd45864e54fb921c1d1bb2428d6d057fdac978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to deliver second-stage payloads or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=antenna+point+app+for+android PDF link annotation
    • http://autoscuolecasetta.it/userfiles/files/tefiwumopanabovenoner.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613243da7c400---pagot.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2b6edebcad4ed38631477d64cc285faa/wodosopopuborap.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/firopalawos.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/naloposagevutamafaped.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb864be77---92795881381.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210912114703.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/45306859295.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/30188602708.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/difekewodibolomoga.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/gokax.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f640b793b---12167574975.pdfIn PDF document text
    • https://digireg.sk/upload/79807596389.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/bojumelow.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/49174014748.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4e97fc5ec97738c2a0bbc895213fde62/42403088860.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/83414226046.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/c26fp5on0n91gkv03p4avjenie/92357561490.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/93465191720.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/sirita.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/vedukulimi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/53128605166.pdfIn PDF document text
    • https://stvorki.ru/files/file/81992454865.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_off0000eb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB30 17368 bytes
SHA-256: 70a8750d7671f4df90b450c7c4122e3ca10f194b8d39b73413ed9505028d5719
font_01_sfnt_off0001183e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183E 10256 bytes
SHA-256: 155f42ab7bd8cc0180015c614aaeffd04be429de086862c7c0458a58278104e2
font_02_sfnt_off00012f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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