Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96f930caf6db7b2…

MALICIOUS

PDF

81.0 KB Created: 2021-09-27 19:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96a6d5de0abcd9cf38976176adda3274 SHA-1: 36912068558a487169c55cae2f14d341b7d4c193 SHA-256: f96f930caf6db7b2ac076fb9703706a0907694f00562a9fb09488f7cf5d38ed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads. This suggests an attempt to distribute malicious content or phish users by directing them to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://gmicropilotes.com/uploads/files/mawudefezomeribinifujetiw.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/36399273426.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6oci1rcb5lrq0vbsh3png8vel5/95811365600.pdf
    • http://frickcontrols.com/uploads/files/gufede.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcc5905272---dasawikazidexon.pdf
    • https://msiutilities.net/documents/rifeber.pdf
    • http://ktcz.eu/files/files/54852586299.pdf
    • http://www.urbanwaterways.info/files/30155056806.pdf
    • http://immobilieninvestors.de/userfiles/file/70978985951.pdf
    • http://lhdrum.com/User_File/UpFile/file/20210916062325_bG9idXN1Z2l6b2Jvd2VmaWdvZG8=.pdf
    • http://noithatmyhome.com/img/files/garodubenavikonoba.pdf
    • http://i-tos.com/userData/board/file/16503603957.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/64564073970.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d219d1be8643c80f7dc3a588774ac457/48582499724.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/situferun.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/vi853qg18cm6tqlo25kl06k143/81702993967.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/36091222926.pdf
    • http://montazenabytkupraha.cz/files/file/98971482378.pdf
    • http://hkbroadwin.com/userfiles/lofuz.pdf
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/91034564160.pdf
    • http://gavionescodeinsa.com/userfiles/27967587206.pdf
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/46928918390.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+telefonlar+i%C3%A7in+tema
    • 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_off0000d540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD540 16792 bytes
font_01_sfnt_off0000ed52.bin
2b76bd9b3352eb41547f39ad1f0b1e801d00e62294c33b4434b832a7ee64a1b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 19220 bytes
font_02_sfnt_off00011cd3.bin
9a58f2b6d1fe6233b6d97da095099e944cb9c5eceae5619195967d6219da3c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD3 10524 bytes