Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1625232046a87c2…

MALICIOUS

PDF

89.2 KB Created: 2021-09-13 15:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b59dca73ef21f48f024e905edd1aeb74 SHA-1: 008cbfbd9064e7586bdc7680b9d0bc0d376a091b SHA-256: c1625232046a87c24dac6369f57d7a83a49dad8188ff5c65a4bb930cc1a9a28f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. The primary goal appears to be redirecting users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://hyosung-gulf.com/uploads/file/4046564029.pdf In PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/kulimutusotinafuluxugom.pdfIn PDF document text
    • http://qwerty.pl/_data/file/17277383327.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3ce34436a---monurafugazerovixisasob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613948cc41f07---watosem.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/wiminusugenusodadegasiga.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161388793f04d3---mololizaluvafexag.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15a2cc179---gakogigata.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/24679834253.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/8059451350.pdfIn PDF document text
    • http://fohow77.ru/upload/file/5633278272.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/51841014335.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/jojijujozowuba.pdfIn PDF document text
    • https://iohrp.org/f_files/files/jitewamezibivarerafep.pdfIn PDF document text
    • http://peoplefoster.com/pliki/wonaki.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/dupidurev.pdfIn PDF document text
    • http://hybsch.it/upload/file/jiveboxewopowuxi.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/75284026027.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/35826075338.pdfIn PDF document text
    • https://ijpdua.com/contents/files/mogutilun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=skam+belgium+season+4+episode+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000eed6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEED6 17872 bytes
SHA-256: 6a032b39758c62c873f447a48d56af7bff11bae14fab79df58906a0643d41782
font_00_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 19472 bytes
SHA-256: 18b4678a7298e1c83ce2e9e4ea31e05660c829abd8712d8d18509b54255e3add
font_03_sfnt_off00013dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD3 11072 bytes
SHA-256: 28f9ccc7f3099304d45f72505f816107d64512fabd9736f3adb0e3e193a7bfde