Malicious PDF — malware analysis report

Static analysis result for SHA-256 f550c9811bbf6fcd…

MALICIOUS

PDF

105.6 KB Created: 2021-06-27 22:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 669b1b89851cf6b2fb93287d01779dc4 SHA-1: cd904cb01364be53a6fb90d572665243c166fc3c SHA-256: f550c9811bbf6fcd623fc3f6e16c35e897a22d2b8a352b86df2e6b9c411b9227
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on compromised CMS platforms or disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

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://nomylo.ru/uplcv?utm_term=paranormal+witness+man+in+the+attic
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c97ff41614---22277186212.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210526193253.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/0ff36c2889817497a5c89f520cb8d16f/nugigewuzefetigafo.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/gefemewugogaxos.pdf
    • http://kingalbertltd.com/uploadedfiles/file/44698547817.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23800901103.pdf
    • http://paliukenas.lt/i/File/45897483218.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9bjsl4cgvj7sp8a7u8sv26bos0/92504730324.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/616ec7e39243d947e93f1112e8d606ef/fiwuzezofupesijizeb.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c95c7f3e675b28f2f3686126c9a25253/xakojobapakakikitog.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2dd3ff04---63498549325.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7627f3604c---gokofifokawex.pdf
    • http://richmediahouse.com/admin/uploads/file/74202061259.pdf
    • http://szpk.hu/_user/file/gilamevetabetivujozow.pdf
    • https://medtek.vn/storage/file/poxiv.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b2ee492336f---55015066164.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954c981140e---92503500584.pdf
    • http://itkaufmann.com/images/fckimages/file/51873641184.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c7eece6b6bd5ff7307206f844852e8bd/kuvaligudux.pdf
    • http://dok-vo.ru/userfiles/file/kilixamikejofonomejivodi.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/cf820befaeeaa8beca593abd0a8711e5/29549825139.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0048cade75---41047715569.pdf
    • https://myphi.biz/nbloom/fckuploads/file/xaxuzunafimefalutafunup.pdf
    • http://darec.sk/files/files/20275934880.pdf
    • http://gmei.lt/ckfinder/userfiles/files/sakefanozusanafak.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012035.bin
004e2d741169c4dcae02a027d56cfa6ddd3ef1e6c4815a225456120606fd87db
pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 18568 bytes
font_01_sfnt_off00015139.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 16792 bytes
font_02_sfnt_off00016950.bin
dfe4fd9645d06bd9df6226cb02e6af69cac7ae0f9222a83ce3a6ff280bc0b255
pdf-font-stream PDF embedded font (sfnt) at offset 0x16950 10584 bytes
font_03_sfnt_off00018156.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x18156 16092 bytes