Malicious PDF — malware analysis report

Static analysis result for SHA-256 01ea76efd31a60c9…

MALICIOUS

PDF

93.3 KB Created: 2021-07-25 01:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24e61a52568943bd1d65bdcfb63a7654 SHA-1: 527dce70a9039c340a94e7672e329eba5ecc9137 SHA-256: 01ea76efd31a60c9c4009c77b21e647e96b38d9f2ee2858eeb80d780f2a33324
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://topupdana.com/contents//files/49131405670.pdf In PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/rabukozasuzotu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/r5lgriao2cv80d8u7c0bvti362/82414753474.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210612062947.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085910f3ed8c---16573819999.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/ropumabaporeloripaxulu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/2082ff289813be5366951f8a24f66022/64437570553.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb715f033---60968937912.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/weviloroxavimiveka.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b772d0cf1ad---wefowigotijizupufo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22c8944be---setudisile.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e728c93a---27028120122.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/eaedc7646c36ab189c8ecd1a8a042f72/vetojuvuwurovazamesimig.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/8385166395.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/91870963930.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/05/files/210531021131.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6efaaad6e2bcf5a4d3677dcf913276ba/1156476702.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/10959496541.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/16258561375.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97486ea09---69355991958.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f26608224d---54294957193.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/08a640111c3c3d5f30fe033ab7a8df53/43244515132.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb02bb1da---zudevatorijigexajed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=who+are+ashab+e+kahfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011c1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C1E 18728 bytes
SHA-256: 3829720230b14986ab54e3a330f6c36f9b03be19934235b8b373bfbe2b6cad62
font_00_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 10196 bytes
SHA-256: f7fbef46bf00f2481cc3b15c64fd8f69d62c7f2a276d265bb97c3673e5db6faa
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 17348 bytes
SHA-256: b61cccc3b52a9086c669c863f4b5a9ce310c2e1b89d2b02e8dc72f293513c97d

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