Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bc174e496e349f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 07:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4325142c9a146d8d31299c6c4de8e582 SHA-1: 6699550244fc76cc1d558061bc5b7547be1eed51 SHA-256: 48bc174e496e349fc0a251434edd26681961464cfa394dbda9f193ebde7d6ae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the nature of the heuristics and the presence of embedded URLs strongly indicate an attempt to redirect the user to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://ags-car.com/upload/files/riruvajunerewivig.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9b083518b---46134906007.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lqat5ackh3blo8ktj04jasn0l5/67433709787.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/50995417387.pdf
    • http://chetaomaynganhnhua.com/uploads/files/98375557757.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606da5fdba64e---47847678844.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786246cce14---38731097982.pdf
    • https://foodphotoshop.com/userfiles/files/pogawugepizadam.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a9fc4811a7---gumoj.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/68772606610.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/nuzutubujopifamu.pdf
    • http://austria-ex.com/images/blog//file/penotadekiwa.pdf
    • http://kayapalinakliyat.com/file/42016285425.pdf
    • http://ylphs.com/ckfinder/userfiles/files/72588810991.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161073338941dc---61071287750.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/0c9b7c647523495e79ebcbf95bb7c50f/79042788401.pdf
    • http://cga82.com/admin/File/nadivanabi.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f320cfcea---gifowebuwopu.pdf
    • https://tarzminder.com/resimler/files/zefenazikafafisukuziviti.pdf
    • http://ssatripoli.org/userfiles/file/68590954593.pdf
    • http://rambud.pl/uploaded/file/8706084423.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/fa7a078b82a85e9d4cd13480c080a7f7/29322825657.pdf
    • http://www.jobibon.com/admin/userfiles/file/97911290902.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b27fa18bf7---13744002069.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=4+times+table+pdf
    • 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_off0000bc78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 16792 bytes
font_01_sfnt_off0000d48a.bin
1022e2261aca16e78174c49b8abeb5085fb620a1e412eeacfe909f3189e9b1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48A 17164 bytes
font_02_sfnt_off00010065.bin
0542951de66d58ec46332ba50d1f2f6abbc672afe1e0081b53d7a673832d7213
pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10456 bytes