Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a35d1fac8e2fb7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 09:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b6a75788e8d1397d1171f363a0a083b SHA-1: 11aba429042372bf6730193b77cf0377eaf50ff3 SHA-256: 34a35d1fac8e2fb7e0503d6112cb31544baca4da2dbd5e5b95a15d64811c3f78
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://madspot.dk/ckfinder/userfiles/files/nukuzuzu.pdf In PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/jelipizunofi.pdfIn PDF document text
    • http://hotstamping.pl/files/file/setixureni.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/13281060976.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/barevesaje.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/funilevu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea30e0fed7---91038094998.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/6660909290.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/45473020270.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa20cc25---521386093.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/44606609475.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161361cb561ebc---97846400734.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/ninikitefulupozaniduve.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/jezitisutevezipofip.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/62099280993.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d2137e8c---wumisekodudoketedisax.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/27320833959.pdfIn PDF document text
    • http://reichspfarrer.sk/file/57448653602.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/sivilotikisupaduvovuje.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1caed117---31003782878.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/89446079388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+rebirth+harley+quinn+code+generatorPDF 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_off0000d6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB2 17512 bytes
SHA-256: 4542a661de2bb5a10404dacb0c3b42ac378f13c42377b7536e7b7c7b7a642388
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10956 bytes
SHA-256: 2ee2f247e9e0e1cbe93b8c0075bf0a04ef67b236fbb0911b03e3c2177f2c451f