Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddea03bfe48da11…

MALICIOUS

PDF

83.9 KB Created: 2021-07-03 11:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 51bcc3db1f700d5bd7dd33b0252b9573 SHA-1: f4ca3e908907cdb6c285b6513ae317e1299c7f77 SHA-256: cddea03bfe48da1169908b116f621fa04938e4209593ae0a95b272d933f2d3e0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The primary purpose appears to be directing users to potentially malicious external content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097f73a90d48---gefirajereropafonadano.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/92560513014.pdfIn PDF document text
    • http://congluc.com/upload/files/figotujuvanipa.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988348ef31---26338884623.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/vev9v25hs0f5u01rb3ued0bcr0/9930771071.pdfIn PDF document text
    • https://airbays.com/userfiles/file/rijududu.pdfIn PDF document text
    • https://t2sc.me/userfiles/mozetibub.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/gorewepafoxoxisuvuve.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8tavt8ja7k032h5u58aojjtm2f/97389219230.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/db984ba549cf5da5079e3adb6ad02ef9/pubifeza.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/woxurekun.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a901be09---34472265130.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/86220162068.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/mefiromonigokufe.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/68562998347.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/f551e6161fdbb3128ef6c776e54acb0a/gomisajavegoragoze.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53a3b5f3a---19103521134.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c62666a59---juroxepemoropinoxonez.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/64b7d2d340d0becbffdb4623c11b7c29/17363578537.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dapirenupizugison.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/koviregopejokidamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=meaning+of+rbcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE559 17072 bytes
SHA-256: 62a9de9da3446ddb9d2dd12bb428f24525f83068ab1b88c12171e76f94e17d0a
font_01_sfnt_off00011226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 10332 bytes
SHA-256: bce90f8dc2b49e392010bdd377a3fcecf21340b58d6c068f8b7abf58526a0976

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