Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cc1e34414bba7d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 18:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 034a5592dc4101271b8dfa7ab5aebae6 SHA-1: ffe148d0957fc527d4b74290122d34ad51347163 SHA-256: 53cc1e34414bba7d0c2a262ecd762a5f0901332e2895db18cd6de8758617438c
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • 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 http://harlit.com/ckfinder/userfiles/files/20210801_134420.pdf In PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/28232376218.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/fexokega.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vp3rblb8ijotb5f5qk2ij3kkba/48106981320.pdfIn PDF document text
    • http://atomleasing.ru/media/File/xededebajabodas.pdfIn PDF document text
    • http://art-ball.net/files/file/85099585863.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/8797856491.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad3210210---legewagolazubururaf.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/sujotogetiwerafexo.pdfIn PDF document text
    • http://njxinbell.com/upload/files/nawadujoja.pdfIn PDF document text
    • https://x-software.cz/data/file/19978202046.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/6857922807.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/gsbfi9qvfno6e6ivpb5hh6pn15/jorato.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/91573216741.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mixegagoxopigumakelutir.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/22255852234.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/buxakanibop.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7f3376df1273baf9e0c0b2db9513a6cf/vafuxowubopipikejijazo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160894c84e6725---45383995174.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe55fcc4df---digufiwejazizafoli.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zugoletulovosapodetorepi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7beofbhisjaqlrv8584gir5f0h/vidufapodorotezebada.pdfIn PDF document text
    • http://fnathservices.com/upload/file/46058872573.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xapifirapuvepesej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wellmate+wm-14wb+manualPDF link annotation
    • 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_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 17424 bytes
SHA-256: a6fa2b8e8f8532b49629019167264f0d6caeb37aabcf47e4523830ab6135a348
font_01_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10272 bytes
SHA-256: 8ac316c51a95bfe6a16a85c3fa36a55b39226f2931ff78e77023d9ffd9eb986d
font_02_sfnt_off000112f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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