Malicious PDF — malware analysis report

Static analysis result for SHA-256 7534a1a1151c48a0…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 08:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 724843d1e7fa825fe0ed3b0c98605e2e SHA-1: bad05e52f5c1c43706fee26827386e5825f23ac9 SHA-256: 7534a1a1151c48a07197469bdd4a796550c1ef921e2903c305a17f256f8fa4bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a large number of embedded links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. Although no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/24e34d4defcdcac1838f4649c6e79e20/30052320334.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da386223536---93501960.pdf
    • https://farmaciasacoor.com/site/upload/file/xezenosolesotebune.pdf
    • https://huuphongplastic.vn/uploads/images/files/78576432062.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd76af4749b---46075624646.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609dc9861f874---gofuvafugaserosufuvifupi.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215211537173922.pdf
    • https://webmenuplus.com/images/file/ralakejeleratatoxewuda.pdf
    • http://amctop.com/board_data/editor_img/file/202106221702.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b285477f9---zekupokeded.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085111170847---faxeferoporituketazeje.pdf
    • http://savalis.ru/userfiles/file/zosatoluxefuva.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae58f3a2f6c---bejunigamuzujodudar.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8340fd2db2323fdf8c490ca839d41ba0/bopokunudumijojet.pdf
    • https://advance-pack.com/editor_upload/file/taxusigi.pdf
    • http://alhouti.com/userfiles/file/68967395873.pdf
    • http://0965818789.com/CKEdit/upload/files/gegadu.pdf
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xipeborojexoxozevusan.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/tamimofevavegokofuxomokov.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b18358a04a---52886911791.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/955ef08e661fe088d712f38d5af23d79/50187487555.pdf
    • https://parc-hotel.info/file/15758965388.pdf
    • http://kencert.vn/uploads/image/files/7051945612.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=luke+chapter+3+quiz+questions+and+answers
    • 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_off0000ead1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16792 bytes
font_01_sfnt_off000102e8.bin
fbbfc930b2579e5c1f222a26731a1f8b9c044879ee1da6f0c9a7610536f590da
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 11176 bytes
font_02_sfnt_off00011cf5.bin
903f5c449943efb85aa8da1b2478d23061446306e88811df63f7fe55363f63de
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 18056 bytes