Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d3a412a5e715caf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 18:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7005ac723310163d6c036f8b4a7c158 SHA-1: 06058fbd8be9146c8998ac516f643efccfa11812 SHA-256: 9d3a412a5e715caf81e69ce81e2142051cfc03a269d31efbd6003faf2c2ea64e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a lure to download further malicious content or redirect 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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/887882eac3b974f6669abd8e1adc7eea/mutopoxupuxuwizezopakogu.pdf In PDF document text
    • http://labotinnghia.com/img/files/lexugemitilo.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623196146.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/87806018991.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6984690961---mekinaxox.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d7336668---33138484343.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ljhpffi4a4aq999qevg7iuvqd6/91989244687.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/71889777617.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/53598181006.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210510113406_901824691.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16120d7a2667a3---bapurugunuwukinanetovadok.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16121763b5d3d1---24923578716.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/pewimuke.pdfIn PDF document text
    • https://blugarden.eu/file/84207513879.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/19016834525.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/160625321078.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/bukatadilazodowofosu.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/82146252648.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/buweguwavenaturo.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gakozesowotoxusumefekimi.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/31289871660.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/xurureg.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/berutagelisiguxetodoxom.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc3b898099---76869136583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lexical+meaning+in+semantic+pdfPDF link annotation
    • 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_off0000c082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 17140 bytes
SHA-256: 26d2854eeca3972a026b702a8e2e22b34c06e897b27890ae8ec2564a13729142
font_02_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10800 bytes
SHA-256: f9b8a768b1fe06e2638e9226cdb9e6e24a0327979dbe08908f54661c5101064f

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