Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ba050aa449abba…

MALICIOUS

PDF

89.0 KB Created: 2021-09-11 05:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6362a53688858a0adc7c1fd1ed6d08f1 SHA-1: 184f133bf745e8042909b1072f33c3ac636144c2 SHA-256: 70ba050aa449abba00ad71fa333f3a8749a3ebcbafd30a0ed67cb7161ecf78a7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133a84f5d6af---nowamefage.pdf, are likely intended to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://china-engine.net/ckfinder/userfiles/files/94748240129.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mefixi.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/61257191021.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vikegatanipuw.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/13024258146.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/50029929963.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/eb9fbd737a2126eef51a0121c2e86250/kugogilodilep.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/tabon.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16133a84f5d6af---nowamefage.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/felonuzir.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311201040e3---bezoperoriluxiroburumak.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/sitivexafanovi.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/zatavaxefud.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/64870501327.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358fa89312a---56470553044.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/381d564ff97c63743927aaaf10bd4528/natav.pdfIn PDF document text
    • http://coachhouse.info/assets/file/47860148233.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/wuwuzuwiv.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/neranojeduzatotigilifik.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/bagozabepogulefizuturir.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/tebokafabedutasoxodis.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/94336864846.pdfIn PDF document text
    • http://scro.ru/pic/file/vedixade.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd8c905f85---wakabudug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=nes+games+mod+apkPDF 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_off0000f76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76B 18176 bytes
SHA-256: 25762bd72078c923eb5971e1b1ec0b620b392bb1063b80c40c56f34e47dff4b9
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 10364 bytes
SHA-256: a1960d66ba0a0e6dabcbf604849e96830971cb500643a43d0ed75df4835020ed

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