Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e271b6958d91af3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 16:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f37620a68915a37aa39692c6d213c36 SHA-1: 70dda47f0f89823f843f4c4decb2979dd3d7f121 SHA-256: 7e271b6958d91af39bb67a241314b46a8b775fa66ffb11a2a8c10b84eef26f91
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to potentially malicious PDF files hosted on compromised WordPress sites and other disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. The embedded JavaScript is likely used to facilitate the redirection or download of these secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221f55cb86---kudelivemiwawogoxujipaba.pdf In PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/80839606973.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/47120593602.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/motudomil.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/nutejaxogimazobimexibex.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f3a769723ea537c55bd5b3df1c3b07e7/52724717133.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/lowujejafulut.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/43797333843.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/37924946348.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/pexerunolanubuwo.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210815_B65B2C8FE84665B6.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/51521996267.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e8455fc82---rokove.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/34862059817.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///pivikuviwajagim.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/nidijewoxiwurelabib.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/loxidadikasaxulonotisugu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118ec0b0703b---vosekunubevovurop.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/tipuwavojazirapusunanimi.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zujobat.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/84839123193.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e396e1eaf---gijixi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7205527429---80966089967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ampeg+scr+di+manualPDF 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_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 19552 bytes
SHA-256: e8c58b2e6380f5d2c888d6b131d390aa83d929f4a8c24cbe05054bf81c716d37
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 10720 bytes
SHA-256: dde3b49b816b5760bf48701560664de60af3e6c00034cec3349b2740d97158fa

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