Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed77232a617d3855…

MALICIOUS

PDF

102.8 KB Created: 2021-07-23 10:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e573eec97cb0f329d8dd181b35e51871 SHA-1: 677d9dc62e089486512636868de6640551c5050a SHA-256: ed77232a617d3855ba99181a7bbaddd386d5fdf81fa2fa7c437304f758bbd2f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links pointing to compromised websites, specifically leveraging WordPress upload directories and form plugins. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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.
  • 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.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cce20216b---powigikumejowanetumexuf.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6559f36a---xetepetixulam.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/dalofemila.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073749baf253---36562070174.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe52793c4a---6845969698.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fe4d1401749b9cdcdb2cf807c019fc7f/losezegesesulajimizopo.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/leteposoro.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f2003006a7---87587406965.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/84837944133.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ac0f79216cd266ededce946c503b532e/57185304160.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160f47f542de24---62914506616.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91fc397aa---tugazor.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/dtg8io47q39cvtbagqe5hsj820/tefudamamomovuzofumazas.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/141253921.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db8d3d1cba2---lepizu.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/31895963302.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/48989701394.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/56e99301f1ab758efe1091bcfe21f50c/kalijavatisod.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa833fa91---mamamed.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/kncq67bidr8gnhdo06fe276lom/26284948393.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b4htrg6bt6sgjdmfbj4bdasp24/35012842621.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/75857090594.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jajhnm2anh19h6ebqvntlu5phr/valawokowowerewepotiset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=atomic+structure+jee+advanced+notesPDF 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_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 10760 bytes
SHA-256: 645a54f9acd5aae3f75dcfe87270fc4413da9ec064e6846dc1b41cfd730fe1fe
font_01_sfnt_off00014713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14713 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F25 17616 bytes
SHA-256: d03e18b419e41b0737ea8953d15cc1dfcae801b7a8bc6ec5dafa3c3ea1ae9945

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