Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f515e0a937a19db…

MALICIOUS

PDF

83.3 KB Created: 2021-08-16 10:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2216d732fd2cfbc4c7b8d6da055e5bb9 SHA-1: e2c11f277b72e0363d924031ead43e92e749c29b SHA-256: 5f515e0a937a19db76b9f00711fac00316151846e87fc0a4bf6154966ce0b1f0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple distinct hosts and a high number of links per host reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d3775e1f---97952535586.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/36362115641.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210506063424.pdfIn PDF document text
    • http://zuche0551.com/upload/file/6701139383.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa3543ff9---wonanafofudurixopixiwere.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/12540354092.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/vufavuwuzo.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/fexufatoluvizoxesadofatid.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070120220490.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160700ff2a1cee---17212565582.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/4579005374.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/96a4635e677d188f7d1226e8599a349e/tajowedavatuven.pdfIn PDF document text
    • http://househouse.it/userfiles/files/95299331244.pdfIn PDF document text
    • https://tigaintan.com/contents//files/70237987021.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/daxalad.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc6969a085a---pokazexexejaxonok.pdfIn PDF document text
    • http://holzbau-napetschnig.at/xudarijijolemes.pdfIn PDF document text
    • http://emannsltd.com/userfiles/46776140563.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10d6164d7---96170008808.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/79153356714.pdfIn PDF document text
    • http://theshippyfamily.com/clients/57051/File/letekodafutofevud.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/77304897846.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/03ea5f5c11f1a004b47ccc7576c33eeb/2340997134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=colon+and+semicolon+exercises+with+answersPDF 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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 10856 bytes
SHA-256: d72350169d5e817ce9ad937b817d55bea37123ff4f58dcf69cba689d36b244a6
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 17092 bytes
SHA-256: 5c75a37514cbab26174cfe156065f295e62435ab1171ca9ab3ec5f18a85fafb6