Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d6e7b634d21de1…

MALICIOUS

PDF

89.1 KB Created: 2021-07-05 04:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d66ccc7ee0ea4864818a0269db056c9 SHA-1: 241c8cb03cf6ccff4e2cc4dcc67229cf7f844ba6 SHA-256: 88d6e7b634d21de148f6a97fc0477da7b8bcff2f6cdeb97b423159590bef3359
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, likely intended to redirect users to malicious content or phishing pages. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/3a90a057fd5d6b460113b801b0451bf8/zitesipoj.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091e68f3b3da---52139234129.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ksf56cdk241bvtu0frslsdml16/vaxudodufug.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/74511e82be7a97fd7b9ee1c0fa561338/73445725444.pdf
    • http://vidol.nl/userfiles/file/11996494060.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/hh4dcsd1o0bfq2a6lsbfg7j71a/62898865263.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/1369449c56308fbea062256c7a2a8128/kexevepovopuf.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i0t1mtjk3u2mvn24hl0l1sgqpm/61310417842.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c6d72896---99771529749.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/325efd2656cff25338f9b213d00d8bdc/35525783194.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5to6dp1nkl44kt66i4d7dqk5br/79934499029.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/p3g15n3fsmg4fjplc7mtrd8lfo/62626479708.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6908c2fdf6---vebawizesufabivesemum.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/bas3nkcgd2d0eqrbdb68am80rf/53842309168.pdf
    • https://mamo-tato.ro/userfiles/file/vijovinak.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb38160150---fikutufu.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/156f729a1cf829e862d8b1a88532ee53/29619883140.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5f79e5008---4765720428.pdf
    • http://chapelguild.com/images/usr/favubetefubi.pdf
    • http://donghocasiochinhhang.net/uploads/userfiles/file/32418890491.pdf
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6bebfc2f---tolekinupakukuvinudu.pdf
    • http://veraschwemmle.de/fckdata/file/15900484244.pdf
    • https://egyptsuntours.com/userfiles/files/nuferoluxa.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/fasdubskhog75obf46itq3qn01/jatarowevabibulakub.pdf
    • http://elazentrale.de/images/uploaded/file/59364694478.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+mummy+2017+dual+audio+download
    • 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_off0000f7a2.bin
e330b716c6f68676878c60821d3931c298fdaf36cfb1a6fb52e018de4fded2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 17824 bytes
font_01_sfnt_off0001266c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1266C 16792 bytes
font_02_sfnt_off00013e83.bin
894dedbc4bad05caf89a4c8ddf6612e46ef10fa76206dd085c575f0d00366e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 10752 bytes