Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b4e7e1e02c6f8…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 02:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa05536f12bd6cb29388384a2b8a90a0 SHA-1: a11dad7892110efc4a7be213965f13e2e1c91fcc SHA-256: 6d6b4e7e1e02c6f8b52b912f4990422a2bbf47132c620301d0129b3393aea50f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or SEO poisoning attack. The primary goal seems to be directing users to potentially malicious or deceptive content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://huntic.ru/uplcv?utm_term=best+pokemon+gba+games+with+mega+evolution PDF link annotation
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412c0216e0a---wulokazukijirakusob.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/74583470014.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/97120694619.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/10283887760.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/84356139141.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b16a9c90cabcb166b3cfecba5f02e957/4786092940.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7a3241da00e70dbfe091c6da6e8fce08/lavuwafuz.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jiminegumixonikukuzalasu.pdfIn PDF document text
    • https://taperagi.com/contents/files/bexodon.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/edd1d4d4558c69db684d5b191216a37b/juzaxunelivamira.pdfIn PDF document text
    • https://razredna-nastava.net/files/63262305677.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bowabomowu.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/10859508432.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/83961963153.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/sifejidakibibonufonu.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb0773a24---pixegemeten.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/45353184658.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/fd3bf6523e497a9d07c63daa48a3ca1c/99858010346.pdfIn PDF document text
    • https://advik.net/userfiles/file/fogobotavax.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/67333212179.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109171402525544.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/51256436534.pdfIn PDF document text
    • https://digireg.sk/upload/kizoterukomojaxerinoburod.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/naparuxokekomanodumevuli.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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 17968 bytes
SHA-256: 2c01edc258de3c334ce2d177a182eaccb7c36d291fd82af7c7d6be292ea200e6
font_02_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 11136 bytes
SHA-256: ab789e83bfb3fceb7dafe2ccb173634252d49b8cfa289b7f184ac8e3ead6c872

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