Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c4c89ede315651…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 02:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76c317d2a6d62e5e8a61a195a6bbfd16 SHA-1: 77bca4ff33cc8e96cc0abe0e7187e028e7e71989 SHA-256: 33c4c89ede315651437b0399895a6d45f86fd27ade8e9f2907e7a7b0bc9bf497
256 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data T1056.004 Web Browser Data

This PDF document exhibits multiple indicators of phishing and credential harvesting. Heuristics indicate it's a link farm pointing to compromised CMS uploads and uses lures for password recovery and MFA harvesting. The embedded URLs, particularly the one with 'how to recover google account password', strongly suggest a phishing attempt targeting user credentials. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+recover+google+account+password+for+android+phone PDF link annotation
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9d85e5f2---sunumijosusizugavudoz.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/tujir.pdfIn PDF document text
    • https://etimes.mn/uploads/files/53248435225.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630624010.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/wepijeborixadowukuzate.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131727cb31ee---laleta.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/radizo.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/66385830351.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/mubefigepeladaxuxul.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nolifaparuxopenelok.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ni5cgsc5405nfif0satkvj2a2e/45684041329.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/maganodet.pdfIn PDF document text
    • http://vaynhe.com/upload/files/37207132030.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/papiwebagidumadodimefovis.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/13773290068.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/fafizijula.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109090110193765.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/mivitagukaruxiwaguf.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/85534840119.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2e8809fa7e7c9ceb4fc10781d99aa9c3/56052783733.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/dozidixijumugexomojajase.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_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 11140 bytes
SHA-256: 9beccd74a42c90a78238b92dcfd6ea2f4943930c7be7bab47f857a22fd167656
font_01_sfnt_off0000e2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 17484 bytes
SHA-256: de0e133ff4d2145650fa444da656724ce1f7b9650693efe397ef5a08e8e8d335

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