Malicious PDF — malware analysis report

Static analysis result for SHA-256 57398bdde0840bac…

MALICIOUS

PDF

103.0 KB Created: 2021-07-20 11:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3a0bc38c68082bde67802dead8162dbc SHA-1: 9e46d034ac175395cb108bdbabc82c3a8d18e2a2 SHA-256: 57398bdde0840bac46e791634fca73ee264f24f2beaf333bfef55808a0d62f4c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs point to various domains, many of which are associated with compromised CMS uploads, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f288b6f280---71057161152.pdf In PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160adacfc47be8---rumux.pdfIn PDF document text
    • https://proia.bg/userfiles/file/60959086313.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607be073c77d5---fofelibivetozotojap.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/81030312051.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3e1f29c47---porepinuxepisaf.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/62432637080.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/88311384844.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/78221015462.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608069b2c92b0---97211801244.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9086c67a1---6881683757.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b6e61482---31108037425.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6v7l7js462ahkv55u0hhds3c75/biguzawatonemufigim.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/64c98714d42b5ac94bbd797629c9d5f9/wegibitovizaxobafibuxis.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cbc719d1b---90489918825.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/1udfdufh6lkn12qjg73jgbit75/20640977382.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/92490681404.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/7f0d48e5550ecd6e87b56234afb3a19d/panaxajemesolomerituxe.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/zodukoxoxuretijolirufur.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/26727293533.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/rujixokaderobop.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45e7ca9581---nafowirejape.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160710128c88ce---50739745156.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/dp1a9okk1alaig2716o3ksdh6i/77358289772.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/osrotj89jo61aff5btv64f9upn/sajuliraronaxanewa.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/motidojuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+can+you+feed+wolves+in+minecraftPDF 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_off00012b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000143a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A7 11100 bytes
SHA-256: 25a1d9c01867391ac1b1c318a27a6bcd42ef9a3190f80a90c4100d1de858ba10
font_02_sfnt_off00015d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6D 17884 bytes
SHA-256: e5450c3cbd10cb35da1b5977a162473dbaafa80a6a4d5cdba0864a3ecca9cff5

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