Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec99c1eefbbeaf8c…

MALICIOUS

PDF

131.9 KB Created: 2021-06-28 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 795e4f06bb0d5421f544f5fafadcc408 SHA-1: 2846a7e0e7aabe1a5117e695abb540a14d4760c9 SHA-256: ec99c1eefbbeaf8c2a88340d20e81e1f5ff9de91247091675d1c241f35edf199
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33ccc0e3f8---50329697111.pdf
    • http://md-servicios.com/userfiles/file/42103864607.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998610c0a3---31605101472.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d1b368594---17352492916.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090a695d4c4c---12351144640.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/9f0b7ad5d97549a6dc2b830e3187274f/5315095158.pdf
    • https://marosme.ro/hirek/file/68275556089.pdf
    • http://ipceurope.eu/assets/file/lusutasumara.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eee8d980b---93950547117.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c883dee440---8964845593.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/2310877607034ae4f9d5293b7f2f0228/89432110509.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f02aea866---27122079616.pdf
    • http://thucphamchucnangmy.vn/uploads/files/lixuralakojowikufagome.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/h05ip5agk46hl6htlps0s4bm5b/junavexofadatekiweberufim.pdf
    • http://espacioschillout.es/images/admin/file/33875565466.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7168db07---37398915709.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/92c282f01be045de66f50b65a21dc8c4/fipezowilukojinaduluse.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784b8772b2---85714803569.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/pugukosesuzixetoluf.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210616_21C053EBD546622E.pdf
    • http://bagiez.de/userfiles/file/31820656420.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cd3314ca5d5cfd716f2b41c135a3cf2d/ketigojaminedabijedu.pdf
    • http://unicorn-furnitures.com/d/files/41196184323.pdf
    • https://audit-advisers.com/userfiles/file/5765933485.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb228d81be---parinosisuwefovinevedeb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=alligator+with+long+skinny+snout
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019ecc.bin
f43c44ae8c1a43fdd34609db6612c9d46ff30ce6029d5f4fbfb9a119996a5f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECC 10628 bytes
font_01_sfnt_off0001b722.bin
b874e2431e026d55265fe2351703e4ffbf5eb99a8286c8cc46682557d62450e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B722 20300 bytes
font_02_sfnt_off0001e986.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E986 16792 bytes

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