Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5fc3b7f7a8179e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 04:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26b433b1eb02403fae5605b8dd8229da SHA-1: d8ec4ce65754ceed2efde962d8de613a95f793f3 SHA-256: da5fc3b7f7a8179ea6f2c646302a3faae3b171d8fc37a3fe961cbab1a80250f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://medvor.ru/uplcv?utm_term=how+do+you+block+a+phone+number+on+your+phone PDF link annotation
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161364eb40022d---gebesi.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/55218975440.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/19735708980.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/25625989617.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/rivamovaselagusidemivoj.pdfIn PDF document text
    • https://tepihtrava.rs/files/2533759232.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/tepenasitexa.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/24636007490.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66356995239.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bijop.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/vulipenusepakinur.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eff339ebd5a6f94c4a446cd46859043a/73795195824.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/lorejugimoloxagozi.pdfIn PDF document text
    • http://dsfly.com/uploads/files/63405891015.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/27677463933.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/gokewavidosugipabes.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/99021585439.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/de08ad5f83358be4f81ab310694c0507/zilubegujusedazikera.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bigapubiziwofilivogedu.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/96532510867.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/duwonefizadujolomas.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/32092737586.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/491281637.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/nesegufuzonabavekila.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/vonafijegazuvitas.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_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 10944 bytes
SHA-256: f4da3e403a3d748157623c02277ca8b8df36e9e02b4ce3183ab52c5e7f123802
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 16768 bytes
SHA-256: fc40d061801751553901a72b9f321d20d545f5efc83ceaee46e8c9159d928695
font_02_sfnt_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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