Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec75ce970db655ff…

MALICIOUS

PDF

78.6 KB Created: 2021-07-20 11:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d5549de305f2ca95d71cd2417ccb155 SHA-1: 4a2d51a85e8e5d75016cb27e20be425725766a08 SHA-256: ec75ce970db655fffcbd273b7d6012dd918886076c800ac5c165957ccb931328
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/aad22c80566148bb2ed3a923390d2c76/noxumodesuxuz.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e55ed9a37d922440421a143fc23c07c1/zatelekisavagowelu.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bef966ec5---37061208866.pdf
    • http://studioturina.com/userfiles/files/ruravubopokiru.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/28334172176.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/166e04614829e4bcae6d7a4c224b360e/kebazakeda.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e505cbfd4---35900318293.pdf
    • http://yanartekstil.com/firma/files/53016397072.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/pelekamoxujuranusijakeju.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9d8a2a6461e5431f5a116c659601f079/xegaregeluvezimimifibanol.pdf
    • http://alexhofford.com/temp/files/file/24460193173.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897828e6829---gulepugudodupakowid.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c7da2fd8---66789807473.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087224795469---72083225943.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5e004ed3---witumuwobi.pdf
    • https://saunadlaciebie.pl/userfiles/file/sijokunepovebinajevogig.pdf
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/27438363474.pdf
    • http://clarksville.net/wysiwygfiles/file/pavuzolapaferegogagare.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00ceb17403---lageparerodenoxoxuwivul.pdf
    • http://alrehabourhome.com/userfiles/files/sivilinagududikagaj.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607be12395b19---dutalotifuwumepita.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/kenewopanovugusulowabaweg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=120+kva+to+amps
    • 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_off0000d407.bin
c5408ab35cd4a57192841a185f10ba4d326005af573c20018ecd811747eda0e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16384 bytes
font_01_sfnt_off0000fe3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3C 16792 bytes
font_02_sfnt_off00011653.bin
5d5909fd0db551b74db8de5745792ecb4ec54489f1d5efd1f1ece193fb786699
pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 10292 bytes