Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fc87b7825b4f42…

MALICIOUS

PDF

89.4 KB Created: 2021-08-13 18:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2c9d698ef2f3f264bb7f9b9116d7b81 SHA-1: 30dad73166a4233785761c15547600ef9466d445 SHA-256: d6fc87b7825b4f42ca9225218797970fed2e28acc32b4f567795dce608a882b6
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a larger phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. No scripts were extracted, but the numerous embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf1d9d0da---55547787178.pdf In PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/38201518882.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/zobigunuwozuworem.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/nokusodokafuzale.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/53352475211.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96540945444.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/jadub.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9380542f67---lojaropazexevizudiv.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/46925813950.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38dcb91e2ce48a1c9eeae07534beb3d2/1224081146.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e0e5929fcf8d77f6edf443763ddc5594/49058359900.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af98feecba---70074668029.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608581abb9c1b---pekizuvazizatupi.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df50dd2---wararetiniwiroropotusu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/131e2d77a1fea38e20a470ef8a360666/32544502989.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08764bc7e---83230055479.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609831fcaaf98---kimedide.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eb9faef427a23e496850d1feeb0911c0/92685447812.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/nixamavipi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/45531468777.pdfIn PDF document text
    • https://limsurdua.com/contents//files/kevokifusegu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1585a15159---gevoriwozebab.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161153e72bd8fe---95974023535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=airline+commander+hacked+apkPDF 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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 10588 bytes
SHA-256: 137843e0a325ee58b38456cddc1e43862b2e427c43757f8770e6976ae0f2431a
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 23332 bytes
SHA-256: a709c7c96e712105dd2f3fe790a888ac980e02b8478c990b2ce5df4c0423dc9f
font_02_sfnt_off00013d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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