Malicious PDF — malware analysis report

Static analysis result for SHA-256 225cce536748d15b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-17 21:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ec3dc5c3b8ee5931c304bdfbb7de723 SHA-1: 4039511988857fcf82a6aed356760d0975649925 SHA-256: 225cce536748d15b4e3984d2e9ecdfac8d92e008f4d4286e82323073b7a42d33
192 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and multiple external URIs, some pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to host and distribute further malicious content. The presence of a download button lure and callback phishing pretext indicates a social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+to+bypass+usb+debugging+authorization PDF link annotation
    • http://bwemfjhjk.friend-match.com/upload/files/zumiluvurivapinipupa.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61401d6b70b12.pdfIn PDF document text
    • http://billsky.ee/files/file/36730676297.pdfIn PDF document text
    • http://dfanchem.com/upload/files/63138555125.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/91132605488.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/51154732133.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xonawutezikexowododizape.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/15837997759.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/zigikupidatomusen.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/xisitupejiritixefemolin.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/fujesukugosex.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/gabodured.pdfIn PDF document text
    • http://malifer.hu/upload/file/vugajijofuguzizusid.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/85700273752.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/tixemofuxironunijotonu.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/lemaj.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecd0dbfbc---xujuxabuf.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/jinubimexasidilufasukife.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/pumaxufuwaju.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/11664740426.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/23944514025.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/518a4395e75e5c9af24fa85f57030c3d/mirisidizefalenudevis.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/kerovitogoxiziwoxevilus.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/gatixaninezazisafotilujin.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3a489dec7---dadis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 18124 bytes
SHA-256: 3215b615824ca840681aeb8ffac007c0d067cf7b290b47144757c7cafd17351a
font_01_sfnt_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 11116 bytes
SHA-256: a83da46f97f8a58e9c6c55f5e2a82d2bdea55406813dc0769e1c768476f39b42

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