Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9a3a73968618cc…

MALICIOUS

PDF

75.7 KB Created: 2021-07-03 21:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88851351bd9c205426763c4d64cda6eb SHA-1: 9ff8c9e75ec7ae335f81cda20e0c9121c283e5b3 SHA-256: 7f9a3a73968618cc94b283434d3e6a6f8b6780f34245a588e54b317c3d0e3121
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133c1ac355---pizuf.pdf In PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/1fb4da6d3bd412b7064a1bdc2b96d533/42407387600.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6b0d3f42---62040577252.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/84570899352.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077693d852a8---metefefadozose.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705cabd95ae---xubuzubufukalidusojira.pdfIn PDF document text
    • https://farstaslottsvik.nu/anvandarbilder/153/files/fakepepazolowulexo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e120402313ebba626a8accdd540ded56/56610805628.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1007201eb---rusubopexevi.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/lolitepegolukebigenogemem.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/fedozefuxos.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b16b5a679aa---21308609292.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2696405f7961e5bf8d3fdfbed4e256d0/gofenefo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2ce355c63---rasidor.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/25672407878.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/jetozezonenadevosed.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lorojes.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/nomixen.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/22021243471.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/ca6130fb4b640f34f4f272af3503d382/xidelijaredijafoxaxezo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hne2qdh2qto2krr4l3qq69tun4/sinamo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aslam+kassimali+structural+analysis+5th+edition+solutionsPDF 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 18368 bytes
SHA-256: ae3131665d9c2b68d5906758e1551cedfc7b1088eb1a1607818c127f97947738
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076E 11056 bytes
SHA-256: ab57d4670b449c7ac9247b406ffa348b49c8876178b1196be4ab129fdb4ae7ac