Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcfe69b85643656…

MALICIOUS

PDF

174.2 KB Created: 2021-09-06 15:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89dd47cb17d67bb0caa9a9dc8a323b26 SHA-1: e75d375ae56ce8abdf64c3c208a2d3a8ff94d4f5 SHA-256: 3bcfe69b856436560377d29f6c4ab0c10f28eceae804e5de69aadcbfa1c7a3d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary function is to host these redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://philabc.ru/uplcv?utm_term=il+cinquecento+le+fonti+per+la+storia+dell%27arte+pdf PDF link annotation
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22ac6be9bc---33442016492.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/govugaribunebefedewoz.pdfIn PDF document text
    • http://faradbox.pl/files/file/bejufinu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b76fde157a9---sevex.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/5083857524.pdfIn PDF document text
    • https://fond.ru/userfiles/file/73419015243.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/pigiwateri.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b2a47c91f64dccfeda38bf1412206d80/21732093380.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/kilefogikosiluledux.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/2619374940.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f460dc29c---72414101214.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609050e15b1ae---53635668134.pdfIn PDF document text
    • http://jadeite.ru/images/file/83054014154.pdfIn PDF document text
    • https://digireg.dk/upload/jorejifizatawidefanuvamoj.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/rokutinapokugeliparij.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/5a4b4df6fe50f1568483a7f608a1959c/lorofi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160923ccaef97c---xirox.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c5cb4dcb3fb4ed56fe432826c6dac83d/10743827437.pdfIn PDF document text
    • http://esejsc.com/upload/files/jubonaseratuz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/zusotinafuniwelezinod.pdfIn PDF document text
    • https://eventaipei.com/upload/files/53026647755.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/wewas.pdfIn PDF document text
    • 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_off000242d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x242D5 20308 bytes
SHA-256: d5213f8680f63b781db387825b46509b5903cccc7a2a569fea0dd10883f3835b
font_01_sfnt_off0002791b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2791B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29132 10844 bytes
SHA-256: 6b0e6ae0c563e450decbfde1a724b513b89a24e4408d20343821f8ba6a58207d

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