Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99d0d77b546c6fc…

MALICIOUS

PDF

87.1 KB Created: 2021-09-24 01:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3d47fef6637ed839d644bbb077204733 SHA-1: 8e1caa5431e3181ab5d777a41e3a432166b900e7 SHA-256: e99d0d77b546c6fc229b1ef104c1e6d36affeffd5c6383534bab3d1ab97e1ecf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document's primary purpose is to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=amazon+prime+video+mod+apk+for+android+tv PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140341513d20---10022691498.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/26e376f236e64fe52c95c354d4f45b76/zujakudemadewor.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906052506243508.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/laseselojitezot.pdfIn PDF document text
    • http://haphadoor.com/upload/files/86810657231.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55270761284.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/ruzogafajifum.pdfIn PDF document text
    • https://kaparatt.com/images/File/40392726275.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109021433254168.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/memotodunixinopugegofu.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/nixedurugapanubaz.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/38576289884.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///zuwipuxalizowavatowi.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/81584797247.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/lefotebularo.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/kanud.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614063d69c41d---zufixukax.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109181717341539.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zuvefidapujadopixuda.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/pekozuruvi.pdfIn PDF document text
    • http://vaynhe.com/upload/files/dagevub.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xofudosedebex.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/savewa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145dee14c32c---15914294354.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_off0000ec86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC86 18792 bytes
SHA-256: c802fde6e1e4a0989ed15cf1276a602cd2709bb374d84b68fd1eda66d730f6a3
font_01_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13626 10644 bytes
SHA-256: 995917a4d9ba67d18104144f7b6fd9d6b61e95b7aa7fb58fedf13249e17daedf