Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b78078916a4c57…

MALICIOUS

PDF

88.8 KB Created: 2021-09-03 11:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eff80d510a7e5f9fd64188943d1882e3 SHA-1: 7a361126e3fa72d3be615b503800b496151550e3 SHA-256: f2b78078916a4c5788f74b1757dd1979202a7fc98327a15cbcb830e8f35cfd3e
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. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://washlounge.in/ckfinder/userfiles/files/46949789283.pdf In PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/guboxufabipixewuv.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/44865825146.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0397e9a6459dea460940f22dab553c2b/6521029776.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/33069847143.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/jinetewuxipuroziteziziti.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/23240924901.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160732561eef5f---muzeletigoligalarasat.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ce9dca6dd1eefe94c2c2ab6052d36f29/18309261421.pdfIn PDF document text
    • https://alutat.com/data/file/wuravetunofizugadomed.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa590901e4---46022559912.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/41362817649.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/74601943969.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1cceb75dd7---10736074774.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/neomrc10rp5l2gnkn1hroe005q/368893575.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/bogaripokoxojararidavi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105181054.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/sipigakitasegubuli.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28bfd13c4---22815515362.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/90d56b8b8e38ee10bf305f1bcdf8ed0f/26092043431.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/93766524853.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/65085396796.pdfIn PDF document text
    • http://519pf.com/userfiles/files/88265309213.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/xetexogikulepudajetewut.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9e312c8a4---96559636484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scosche+freqout+pro+fm+transmitter+manualPDF 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_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 11064 bytes
SHA-256: a29a6d2ab73d9060c1533215e37e43d4eecbffd5df629f05405d77124f0e4b43
font_01_sfnt_off0001120b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120B 16564 bytes
SHA-256: fab03a043daa943a72ef36c3667669e6c98db32ef075bd0a9ec341c977c26e38
font_02_sfnt_off00013cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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