Malicious PDF — malware analysis report

Static analysis result for SHA-256 3474cf8a512fe222…

MALICIOUS

PDF

89.8 KB Created: 2021-09-08 12:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d10d52145211713529936f796e220e9 SHA-1: a9f92b4f09c249d86f19347bb95eb3a87d4cb660 SHA-256: 3474cf8a512fe2221c12b83953b1dce1d44e183f027811affe6d0620d9a76763
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 http://flomojapan.com/upload/files/76780674359.pdf
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/xafozuforosozok.pdf
    • http://www.yoko-ono.be/images/userfiles/file/7810391996.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d338de61a---wunowavikodukukekibusep.pdf
    • http://retrievers.su/ckfinder/userfiles/files/99714963848.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/m3c1pktn95astg2d4rfqemm8q7/podufajujebunelum.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/dl7tri4e7tcrn72bll4m4hr53c/japupoxibusaki.pdf
    • http://burbank.kopanramen.com/uploads/files/purezajoberigasujedunipu.pdf
    • http://patokapugsnkisses.com/clients/61143/File/99152697092.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee68307321---zusoperowapunup.pdf
    • http://belean.pl/userfiles/file/difugovadopir.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f812b09e90c---46211407439.pdf
    • http://riverla.vn/uploads/userfiles/file/bakegijo.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba972743950---90195364246.pdf
    • http://hornets88.com/clients/56662/File/rawevemotofafodejejov.pdf
    • https://stef-nancy.fr/upload/document/56349644561.pdf
    • http://podushka.by/files/files/sizixabokofazabibezafe.pdf
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/xotanin.pdf
    • https://projectmine.hu/ckfinder/userfiles/files/49571610063.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161153d5aa3d64---73952231515.pdf
    • http://positiveforce.in/uploads/files/durufe.pdf
    • https://bestofbucerias.com/upload/file/tedutanevujulewi.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be95b90a95f---gelasebewifazarevufilipof.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc90a5294e---58005049843.pdf
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/zizedudadojozot.pdf
    • https://cortemadera.com/wysiwygfiles/file/mofezimujalugoxujori.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=design+of+experiments+montgomery+pdf+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f56d.bin
bd50f5dd325c1f096fe3144b737d808fea593fd714797bf39927e8451a278266
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56D 18740 bytes
font_01_sfnt_off0001269c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1269C 16792 bytes
font_02_sfnt_off00013eb3.bin
ea196bd61c2ede6942491ac1960d6f1649020454598d2361066a176896bda1f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB3 11144 bytes