Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b958e7c8deef23…

MALICIOUS

PDF

90.3 KB Created: 2021-07-18 06:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42b90f52e4d3f5831a54ad3a01964c8c SHA-1: fbd7da43927b62ab6ecaec2b3e431365e8167b04 SHA-256: f0b958e7c8deef234272b7f0b3bd8ae41709421e777271aa6555286671ec8191
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071976d2617c---56824186792.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0ab96cda21088183ba17721cacd10f10/85395145301.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4f087381---lusexanutafulovox.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a9b2d4f5d9d3c239fc6d23bcd7196a93/tilefuwagoraruxujawazedo.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/20530236062.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ab7377cc8095f807d684beecd73d5701/wanadujamezexudotu.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/43341617816.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/31940098335.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/f19d872910fd00c494773bb92b33a6bc/24993547246.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/letekuxeka.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5952120be---xezirulunubekax.pdfIn PDF document text
    • https://ckmandarin.com/uploads/gezezovonoxiton.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad52809cc---vofomovaregumomuv.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cf7219b4d---dinunagawijitat.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd6807fd4---pakuz.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/dewolubikebemutopikumar.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/90350821952.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/bunowokimifugegebikanu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9qeu84m88j00vthajkm0660943/8398618438.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/ramozodalafejerirevadu.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/kasemujawegisosoxufelorad.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3684dda402---pipikigaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=70000+salary+after+taxesPDF 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_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 17484 bytes
SHA-256: c7d92c919883292b4b6f1c3b4e6382a7662375755af26ba5153c4d13e19337d8
font_01_sfnt_off00012b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5A 10180 bytes
SHA-256: 2f626de2a332c9abb23269b4fa680f395c02b4e6577538a0e40348d9b412e69d
font_02_sfnt_off0001426f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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