Malicious PDF — malware analysis report

Static analysis result for SHA-256 041593ce4a94cb37…

MALICIOUS

PDF

82.3 KB Created: 2021-06-26 14:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01786f36c8ada0e6f8bbfc12d5d40e26 SHA-1: 272214f12481c01871612bd218d7a0607dcd0b6c SHA-256: 041593ce4a94cb37917b2d559e8d09f89945d83b60090068aa16adc2c9dfec46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4783f1f9c9eace5a2bb0bfe718e996e9/puzetolenuxe.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/95158301196.pdf
    • http://arci-mp.fr/admin/File/jegowagapip.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3e5d9155---gaxavodebegadesunitasug.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/926ud8dbtdl5hsdfoh3698h57k/14556855433.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/epock5peqqkovsangqeupcolsq/11837155508.pdf
    • http://drapa-technika.cz/UserFiles/File/zuvajigilunenerewasu.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/7190132419.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073950aab788---12361429899.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96e1e4b53---25197929797.pdf
    • http://bularz-auto.pl/images/userfiles/file/51522110438.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/916fcc51c17ebcfe2f34e8f1a1c6b843/zurugevufaguvabapo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5tjcarqa2e60s9qv8lkvt37gb4/fosigalunifalelugo.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3faad5d7fd---jowupumisovenem.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/769b3ac61e92fd4a0953e22427a51808/sagifamobimesolatatekef.pdf
    • http://yejida.com/userfiles/file/41603319329.pdf
    • http://kamarkosong.com/contents//files/32976105354.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d169f7f485---29413368266.pdf
    • https://webmenuplus.com/images/file/18228324385.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/luzomefaso.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/06201b036e7a59981a316819f554e59e/sikisife.pdf
    • http://rc-modeller.se/images/file///solejudipadagixuzixipoki.pdf
    • http://esthebel.de/userfiles/file/xogudufujofawupumifojag.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/dk269hnmn9u44340ka3edmcarl/vuzogagomoxewupa.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/fshbc261a0cgd9ethharqh2gb2/53158331884.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=frog+sitting+on+lily+pad+drawing
    • 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_off0000e109.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 16792 bytes
font_01_sfnt_off0000f91b.bin
072be35e4d3f8e128e94fd374ede137901a6331f10dfc6dd55a21aa9aaacb21e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16356 bytes
font_02_sfnt_off000123a1.bin
a25534d75a43a5ad538ae39d71f160f34fc464a288903000059031742f068b14
pdf-font-stream PDF embedded font (sfnt) at offset 0x123A1 10612 bytes