Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca50cc2a34253221…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 02:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94fa086ba485f9f220ec8f6ceac7e8b8 SHA-1: c5db1bb20449da2f5a24ca75a1c9cde7ca36bf45 SHA-256: ca50cc2a342532210ffa28d9fa6e9f3e58b6b1a37b9d7d557bae6baedb66ef64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on disposable domains and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=all+in+one+apps+android PDF link annotation
    • http://yugreat.com/filespath/files/20210901120825.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/rafetopa.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/biguritoxoso.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/diragiwulefemidasufejun.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/91169355268.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/jafegenazedewiduw.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pabebixofalozidezirif.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/22477321372.pdfIn PDF document text
    • http://rafaelokazakov.com/file/rozoboruduxobano.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139434eec511---sovodupatoranazegeladuv.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/tinupulutejofa.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/44867366782.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/35269488602.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/padekomowokewipemuvibe.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/87391284720.pdfIn PDF document text
    • https://heyratacademy.ir/file/lawunijejaditavonamojur.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/lakamudipitapagikijesevu.pdfIn PDF document text
    • http://ozcetinler.com/userfiles/file/tamajupapipimeduxaxuzozeg.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/ee586f799ba8f4cd4349963dd2702d66/1525142141.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6e3a2395---jujukomisegiwolemigim.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/wafigimokazimej.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/fubinol.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/samabinejebuvaneru.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/84002029149.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 17672 bytes
SHA-256: 4fdfc6dc8eb0d89227369a14e30b49b00ec2bfba3630ae137b5289b3d4d838f4
font_01_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 10268 bytes
SHA-256: ad2fbe71c35ee45fce74fc1016c1043a53a86784f2c068910515674ef1bf823d
font_02_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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