Malicious PDF — malware analysis report

Static analysis result for SHA-256 078ae4e6f18fca91…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 10:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03ec682d4cd94a985f2e9ea54d121b11 SHA-1: 993d023c9abc2ad948b759205191a3edd54afa68 SHA-256: 078ae4e6f18fca910ce3e41cc4b99379d7563aa1aa778bb27b9933d5b124d887
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further payloads via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 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.
  • 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://yildizteknikelektrik.net/resimler/files/68921974475.pdf
    • http://holland-ex.com/images/blog/file/61973907565.pdf
    • http://sz-nuoyi.com/Upload/file/2021090913314722345.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da55c8f9f5---84919569900.pdf
    • https://washlounge.in/ckfinder/userfiles/files/vunemodufogexajopenoge.pdf
    • http://mosme.org/uploadfile/files/5716765752.pdf
    • https://biocenfis.es/uploads/assets/file/wavedur.pdf
    • https://classconnbio.com/img-jacson/files/60926403938.pdf
    • https://hotelgaric.com/upload/datoteke/firutukiwexe.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/62347390203.pdf
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vaturiwudigaw.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9450cb231---jewezebox.pdf
    • http://iwayman.com/uploadfiles/file/210905131242070220ek09a7.pdf
    • http://wadsoda.com/UserFiles/File/54067755846.pdf
    • https://alajuusa.ee/media/contents/file/52274069588.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/bunofivekuxazelabiximudom.pdf
    • http://nfc.soo.jp/file/nokefamemo.pdf
    • http://www.moyekolodin.com/files/78325278707.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/35c12e4f203378a00b9b37cf951a511a/lavojerufaper.pdf
    • https://eclearusa.com/images/file/doropumumedorale.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/renifojuvetot.pdf
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/xusasak.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/ribubasenaribumijivi.pdf
    • http://carraracucinecomponibilitrapani.it/userfiles/files/43804744110.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ha+tunnel+plus+100
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b82b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB82B 16792 bytes
font_01_sfnt_off0000d03d.bin
c767d363687c533333f19c96cc4d1b829377e48b323c996f14782636b883b784
pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 17276 bytes
font_02_sfnt_off0000fcd6.bin
6c37fef54d0ae3963383efafcdc297e4bcd45361dfb10fbf351b344d050ef8f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10196 bytes