Malicious PDF — malware analysis report

Static analysis result for SHA-256 037ebb0c1a75085a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-07 00:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3460c65bd4b278e6d34efbe7bd73d1f3 SHA-1: 2e42e7b9821ee9ba5b55512103ef2057c1dd9ac0 SHA-256: 037ebb0c1a75085afb5f086ddfd1dab06bca61a4c73bbea67d7a7988353baad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide specific content, but their association with compromised sites and link farms strongly implies a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/35232ccc76e03ceef893e69931f58d9a/62372775878.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jotuve.pdf
    • http://mai-colle.jp/userfiles/file/15216324419.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160765d06408a4---baxepijuzeliwe.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079981f2c708---duzikubisudageworogawu.pdf
    • http://perseverance.cyou/updatefiles/file/69001836029.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fda500ce1---12376475267.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ec27250ec---bafibenogukujate.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091a5908e945---dosovo.pdf
    • https://florerialafloresta.com/ckfinder/userfiles/files/jobam.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090e94b7b9ab---20109020044.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/13428848093.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rtb49o928ofquu40l4mqddib84/74844368513.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/2daffdecb17a1e6f461e5de2d02cb2ab/zuwoja.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5a2a50cc7b517bbc61ef78237742b070/bidaw.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160798e5b504f9---finebabivirowowesigorawi.pdf
    • https://clearpatth.com/userfiles/file/dodepepojegifuwagojito.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c437c2ba---tutenonij.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7caa076eb---83949679038.pdf
    • http://www.urbanwaterways.info/files/33516332860.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ec1d5d9f---63475651953.pdf
    • http://comp-art.ru/userfiles/file/87982228010.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+amino+acid+a+polymer+or+monomer
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e270.bin
eb9d7f4063f876f98ef4f3463ee024fc757117f2532dd0084405fe1d35a9768b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 17096 bytes
font_01_sfnt_off00010ea1.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 16252 bytes
font_02_sfnt_off00012482.bin
335a80731f3dfc6771e7a3607118e617b4f70cbf0590faeac8211c812e519ceb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 10644 bytes
font_03_sfnt_off00013ccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 16792 bytes

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