Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e611a27e63032ba…

MALICIOUS

PDF

108.7 KB Created: 2021-08-12 05:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 165302e97a1d1344328e5157e20b9b87 SHA-1: e77d1b8f7d61c7fd5599308e2ead90a02b1eec81 SHA-256: 1e611a27e63032baa6334f61247298d33e8578c47c3eef2b3d6fa771267e4d01
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://studiotecnicopinto.it/userfiles/files/66071168712.pdf In PDF document text
    • http://linza-market.ru/upload/files/xebigi.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/68869535122.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/df938f4c1c15967dfe6a2387c18276ab/vipoketepa.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608748c7130c6---18896822635.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/jazuji.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/07/06/nenawemawiruduvipogaforel.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/75187794350.pdfIn PDF document text
    • https://elektrona.cz/files/file/pijalajokuxi.pdfIn PDF document text
    • https://airshow-bg.com/file/jovowonida.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d84589e6---45813220901.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/porid.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/fepunokivitojokagabofo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efd6ad1a6f---veziliretupubebolalutomeb.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/623e6d97a7a68c04b3e16355c4ebb34a/58057513177.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0704/431251bd88aaa608410241253e2c5d1d.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/80658668863.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56048472894.pdfIn PDF document text
    • https://bloomeng.com/uploads/35757427587.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/tixogajulim.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/92187539602.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/9362346427.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16110dc816b0b0---sofeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kathryn+kuhlman+pdf+free+downloadPDF 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_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA9 10884 bytes
SHA-256: 0303354f0eb6d545133966f59ed66f16e24e4040c55de8861afd6ead68a01335
font_02_sfnt_off000174b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B4 18048 bytes
SHA-256: 63e034059036181f30a44d66dae828db7a774ab1708a685d4f7ec5916c7af905

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