Malicious PDF — malware analysis report

Static analysis result for SHA-256 b645921a299abaa9…

MALICIOUS

PDF

119.6 KB Created: 2021-07-06 07:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 64e3b24955cb71ae78163239e8f16027 SHA-1: 41d91020c96cd2597eebf33936947c2811430d03 SHA-256: b645921a299abaa935509ce7ab9250ffadcb1fb320dbaa2f64f0ccc410901844
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 indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, many pointing to WordPress upload directories, suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=cod+cold+war+zombies+pack+a+punch PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aeff8942b.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/7495729565.pdfIn PDF document text
    • http://bptramptour.pl/files/file/jivebefa.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e68bcddb22---gexizifemi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b361f4bf87f---22956674864.pdfIn PDF document text
    • http://canvangdientu.com/images/file/39328236117.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/26546718060.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/77967340680.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ebf1793a8b0084eb313e6eac7e9cd2f9/28039922821.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/20088905826.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3cc5119a9---xetabas.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/sejamipuranibetubodudu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/faxixamopuzozijawo.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/2q2ct9hf116hmfl4rjtu6qggj4/pugavetidopijazewi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f233c4fe---pubajasavabof.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c8ce07c6---37778306720.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/7bfdc196cab538626929405acd0c11c7/99294057802.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/q79vr0nn72at6a6bskbcjknsnt/25125256129.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/porenudunasogotabudoteto.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160866f11d80da---54600771864.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F86 11188 bytes
SHA-256: a429ec21b464c2710ed1e3bcc628b9cbb949d023088ee38bee5cd6992887f4ac
font_01_sfnt_off00018959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A16B 17736 bytes
SHA-256: b3dbdb6d4c9bdd02f0e6d6aeaf9f87633d23bc1926bbb6d76f6c7aaca4bc16b2

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