Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa14b382e6ba8d6e…

MALICIOUS

PDF

86.7 KB Created: 2021-07-07 00:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3630ac6b6ba68b9dd62c8f842a0a1fae SHA-1: cb92d4d592481c8c4127e0a7aa3b670215c834cb SHA-256: aa14b382e6ba8d6e012a93f0216d053960cc3829ba8d3fc28702d2e89fab4b43
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a detection by ClamAV as Pdf.Phishing.Trojan. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to evade security scanning. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rorsjs90avdtm7qnri04p193sm/vonebabux.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/enb8scp25kivsd7nd57co098t5/vafawoxijunavagofafu.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c31fbbf1fe---rumivipezapuxipelatoxoja.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7frblaeo1ii8323gd86amqsr3h/21688188491.pdf
    • http://meadescafe.com/userfiles/file/nexane.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p01sa6inokubujsdghqklfa8v0/xasuzerevezofub.pdf
    • https://chrmglobal.com/userfiles/file/24163504130.pdf
    • https://netshopnepal.com/userfiles/file/14037778162.pdf
    • http://aire-limpio.com/img/editor/file/mifunovepiwidosajupebo.pdf
    • http://papinchess.ru/userfiles/file/dasilapariloxasopazejipoz.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073218adf5ce---8106440912.pdf
    • https://techielingo.com/fck_uploads/files/29590654835.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/142955e8fc0067455b3e72257568c3b1/furizijidupupurilexima.pdf
    • http://jrpst.pl/userfiles/file/91757105174.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06083925ec---wefebefajanep.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/95654114378.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8a04d5b02a6d10166586c75b8aa34d27/vekifom.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782a3ad04f7---kedib.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/96593354969.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8fd7d1cd---wetazemez.pdf
    • http://www.cbs-emballages.com/upload/file/87068065143.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708df3cb8a1---75616102996.pdf
    • http://studio-castiglioni.com/userfiles/files/90502123359.pdf
    • http://sns-russia.ru/userfiles/file/susaderupidadajoju.pdf
    • https://tectrongim.com/uploads/files/33989948752.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/f6vng40pb9n6d06js8eua93dad/vuwegazajifazikavawovilut.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=password+protect+pdf+free+software
    • 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_off0000ef76.bin
59eb8214678a2b4676d0f823914af026296cc3dab2b5d97ca8a1c4c98bab7450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 17500 bytes
font_01_sfnt_off00011d32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 16792 bytes
font_02_sfnt_off00013549.bin
b5102be39f6b59159f1577fe8f21cc48c386379cb35597191d4137ce78fa7a3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 10460 bytes

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