Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a84b4881eb48e0…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 18:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0b0bd1a4649a14593e381cd877a5d79b SHA-1: 9f7e2f927373581cbcb162bdff8d752b99f6073d SHA-256: 52a84b4881eb48e0a3b0c170f2cf9dfcb641b4b3cb895e3ad3c2872115732541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a153014a2---vulesuxokefusowelivex.pdf, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nutrishop.in/ci/userfiles/files/48142922894.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/80925588589.pdfIn PDF document text
    • http://cartopack.com/Images/file/79285802357.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9635c133a---41923757983.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/392jnbd4i2masrqe8ken7gkpk0/67600747221.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/28679404019.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4b742c5c460bee625266d81200ee9dde/49268217804.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/847df983f4129fc5b7cd7e8678b737d1/96586774543.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/eeda5d81875048ccbc7401286f011396/68678037523.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/pajoj.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/5a99d5529be059c63b25476f0027d08a/57898799464.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/bumumewomilorivon.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/60130764314.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/34434736407.pdfIn PDF document text
    • http://meskerjager.nl/media/files/12610487135.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/barebubuzojeledu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a153014a2---vulesuxokefusowelivex.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8741e2767---sopumo.pdfIn PDF document text
    • https://strechybenesov.cz/content/bejorixoluga.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/a3ba6d9c1e74700aac521c64dc96d018/poxagupujulajelejuk.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/jetijitolitatu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a688e3b96fb74967a52d0504661b482d/kasaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=insulin+biosynthesis+secretion+structure+and+structure-activity+relationships+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_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 11124 bytes
SHA-256: 3ffb6323c40514bc307648902f9c4988569392c76c063e943e48f3d264831c5f
font_02_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 18844 bytes
SHA-256: 8c0db9f28c4e4fee885642a0c81ec71870c15d00246b338bacf635b4b662261c

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