Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95b85ab74c6313c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 05:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f55015d90883406159457f92ad21478b SHA-1: 5462a91c9b389b6da957de7ae9b5f7c8a36556aa SHA-256: f95b85ab74c6313c59ac513e7df7a6351dd8ae30a2a3697f81c14b079d00b5d4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--80apefbdm9ah5g.xn--p1ai/userfiles/tusabex.pdf In PDF document text
    • https://manhalhealing.com/userfiles/file/11546413606.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/95898290520.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/midagevamijewufijomuv.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/14667716952.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xobezamamuxaradu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/51108811262.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/dakupu.pdfIn PDF document text
    • https://cargobull.cz/res/file/21244472977.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376747a5dc9---71043166131.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/73864350393.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dusidudesusawojimelez.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/valedulet.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/jumolasonanozesagoxiraj.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b94434dd---wegodapejofesejumuzawu.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/pojenu.pdfIn PDF document text
    • http://fxmeat.com/upload/file/00050bec087d1b73d46cfef58dd4084b.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45639382619.pdfIn PDF document text
    • https://sim2007.com/files/7831353975.pdfIn PDF document text
    • http://e-menu.hu/editor_up/wuvajesuwivip.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914151442238608.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613f788c42b02---newubabikatinifofekataxak.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f526f657b6---regetivukapugepok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=aplikasi+edit+foto+untuk+iphone+gratisPDF link annotation
    • 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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 10948 bytes
SHA-256: d3d2458c725ceedda6f73a4c431efb6ce781cf0375b10249de470c9f3888faea
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 16836 bytes
SHA-256: d866b9a4da2caaffeb62af39d70e2d11a1ee60120b2aad4d60732d566734fc31
font_02_sfnt_off000125d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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