Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f686b45aae13dd…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 05:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c87ba892a7005ba67e9013ad7f93ea21 SHA-1: 1ced931e18e5e172b172566e22a356528550fb5f SHA-256: 74f686b45aae13dda8b3bb31d610a58152639596afcd8eb2aab09626a78f76c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure strongly suggest this PDF is used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=i%27d+rather+go+blind+guitar+tab+pdf PDF link annotation
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/kepigufu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/losamajusavuvufukuw.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612d7ca85e8cf---8288039605.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/15091283353.pdfIn PDF document text
    • http://beateromer.com/bilder/file/17933576108.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/zomevokugilomomurevo.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/gunuladaxagiza.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/munuvowozazupa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afe91a75769---39791329291.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/46287326792.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/acbd2eaff7d1248eeb74a3bf33702efa/kupomosarumupozabi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/271bd63a356c5579cca392f6b88032fe/62185965010.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/rixodenezodomulijif.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0e0314d6---64694192315.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/37618800886.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210818190949.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/mozagokab.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/topezinuxivivebik.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/29215844210.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5c360ec02---77799235714.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/f7b75276f44c9701028a56e9bb51de0f/nozomiliniwexoxolowavab.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/39873449613.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_off0000c170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD982 17032 bytes
SHA-256: 0319d277ca8ad8b0fb84f435b513795a67c10ab65d93c4167666d57800fc2768
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 10832 bytes
SHA-256: 88b17a6bc7a38682954a41580e35eece2895d844c2cb9dd36efd004285bf5d30

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