Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ac4e8ffb6e2072…

MALICIOUS

PDF

84.6 KB Created: 2021-08-13 03:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 401c80b959b9c9d4a01b08b5cb94a5b8 SHA-1: a97b3faf702b47527e6aec751a448d674e93eaf4 SHA-256: 55ac4e8ffb6e2072b44b9108dc84a9c23b6b73e315bf365d5d52930c9bee8e08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest a phishing or scam campaign, likely involving the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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/160a04a0908543---919936736.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086826d69c44---13067898144.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/demegujokatuxutaxen.pdfIn PDF document text
    • http://klefmarken.se/upload/file/vifato.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kokenabexan.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/zazejil.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/60538154118.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/61412690630.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/47237441699.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/xetasujut.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/15685143362.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/56534685237.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/tonibudez.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/94131881488.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/rafafejoximixozurimap.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/32026916532.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3210d7c---wamusadubowexenuziti.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/2228847518.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/40737681603.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089a5f9aac45---57187953783.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893df7576ea---40216664881.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e22829fdf632023c8eea89a9a7b18be/wasoxofozajolalejevinunet.pdfIn PDF document text
    • http://rford67613.com/clients/a/a2/a20594cba7d6fe247bc87ef9b80620db/File/86086661807.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b585uvd90emprvqfh0kitgih2e/81586330480.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160805d314754f---36626996308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+electrodynamics+3rd+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_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 17548 bytes
SHA-256: 9a4b480467b30894ccdfde6ed832135fc380fd334d180e7c36ba48c1357526a2
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 10868 bytes
SHA-256: a134bcc91b45009681d7453832ca5bf903d9877fd0aef0f656c2bfc43f192d32
font_02_sfnt_off00012c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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