Malicious PDF — malware analysis report

Static analysis result for SHA-256 522f76ffbb186c87…

MALICIOUS

PDF

87.8 KB Created: 2021-09-06 16:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4cb59cf0cc1f71d64c9f5ce9e004cedf SHA-1: 47a908c7b0d783714e7200574f48f038791e8548 SHA-256: 522f76ffbb186c87ffb904250e3f4a1a4fb64323cf666ec2d2591fde0510d575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://typeone.com.my/ckfinder/userfiles/files/20102384497.pdf In PDF document text
    • http://franceplus.fr/userfiles/file/92274058733.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09a8acce0---malukejobewiregajejelolaz.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160f6be3cec5cc---suwefobarogevefexol.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/81849439010.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/suboxelaxuvimibizi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p9orikuvj23sc2rqk7hhi8i84u/77774494429.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/mutobopawubiputukunero.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889be2c0049---kolumusodoposeba.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/jelutisepiravaja.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d01f21017---89447042198.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/59940941577.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda3c61b290---23806728937.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/63503988981.pdfIn PDF document text
    • http://deltools.com/userfiles/file/87782737719.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4b985f0b---41773575964.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa954207dfd---25419078135.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pbeg1cq86d72n0nsoc5b2p9peq/71891520506.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/84251657244.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611535c3aee28---risadu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/e672m1vsjetomvd18tscvnhcgm/valaligeletuve.pdfIn PDF document text
    • http://goldmustang.com/files/files/41508978251.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1610793cd47d55---36106013331.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/75426349965.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/pilurojabumujexugor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=squeezed+light+pdfPDF 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_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 10504 bytes
SHA-256: 66d578683619420d352934b14fdca15e69ea45d656074f2696281898f274a87c
font_01_sfnt_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 18888 bytes
SHA-256: 6d8cb2d34930b4affd686b43df9f22d71fd2b87e0b947c6d73952d685cea0560

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