Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc3cc45ef2b7e28…

MALICIOUS

PDF

145.3 KB Created: 2021-07-22 16:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 20de7bb1416a5df262cab0ea3cf2c0f2 SHA-1: 72e769d1c20e89f6b8822ff019fa147cacbf7d58 SHA-256: 0bc3cc45ef2b7e28a7440d9b9d5572664ce9007905a4f3a13910c303e130a71d
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs further supports the idea of SEO manipulation or tracking for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bcbb1caa56ab06eff09b9e9dec3a6273/morelasizajowaxuridol.pdf In PDF document text
    • http://www.heksan.com.pl/file/794970584.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/19526149726.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/41112433653.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/witolojibim.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/tipagazuvoroze.pdfIn PDF document text
    • https://baongochoa.com/upload/file/98340750119.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6f827b97---88749234433.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608002e3bbb26---68879254147.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/69545916453.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/75523719601.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160816bcb83b7e---jukibemitevoburix.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83c93f83a---gukezuribozuwerujudal.pdfIn PDF document text
    • http://slp61.com/clients/e/e2/e296dcecfd7d10ffef0cc83fef253c72/File/80160303070.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/dijugoletesujopivizodomix.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qe52k4vpj609vqga0cir90tp6h/60072456065.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac37acfec---wopuzukixabowoda.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/ziliragosekimoloxuzefusit.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/didokamasibor.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f6a54d35a975a9920772bffe518b7780/12925326339.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/22433459524.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/tulosu.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/7065590360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+the+legal+system+of+sri+lanka+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_off0001d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED34 17248 bytes
SHA-256: 8f7fc70c9910504036f170c922a7d81e501837203f0b708a5e5f3733f84010b2
font_02_sfnt_off00021a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A4E 11356 bytes
SHA-256: 0ed573ea1cdd0315a9f36ca7474ecbd41707853ae8f826f46e010344c479c23e

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