Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7716ff2206c8c2e…

MALICIOUS

PDF

91.6 KB Created: 2021-07-22 11:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 52f24a74cea9a98232ba2e455d1f1034 SHA-1: e29eb536f2fb1b46d6e80cdd2be521e28dd4e88a SHA-256: e7716ff2206c8c2ef1fe1d84d3ea72fb12460f8fa0445f7f47c90501d0c323f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8396324ec---15252200548.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210506164435_1414005558.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/panonabavepuler.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/9765183495.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/159b2e128a42d5cb3195271f322c8407/97462316653.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/89129699406.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/7d3f308a22140efe8df7b9cba5a23670/38818021088.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/3561135437.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4518cd0bd---65806970863.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/63684782189.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3fddd2187f893141a1a0d1d8fa1d4d11/62163144164.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/tagodizarove.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/73bd081f2623b0ba594f058f4802aa66/jeturewiliwurugoxizeto.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/33149773041.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16078a77105568---tosidejetajemofojaguperaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=drawing+comic+characters+for+beginnersPDF 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_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 17140 bytes
SHA-256: e4de406e6ac72ae0b1b369b5ff8e4bbc9b1c781233300d3f8397712e3f975fd5
font_02_sfnt_off000146a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A6 10964 bytes
SHA-256: 6b696f2b12c2961561afe63991578d3b12310d4d78824df2996014fc327c092a

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