Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5e1b61fa6d9538…

MALICIOUS

PDF

172.9 KB Created: 2021-07-04 10:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8bda69f20d717231f9f18e884a3f1732 SHA-1: a183dde0d85959baf95dd0c49f3732a1e8496750 SHA-256: dc5e1b61fa6d9538931b25cc866d885bda245019290840608041a25e4b8d56ec
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • 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.
  • 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://clairerolo.com/userfiles/file/6040875418.pdf In PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2aba7e735d2ead79919baa7f2fa4d427/38982132386.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3e5e3226---jagupesavejemipamipurel.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/80028796617.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/r7n79ktaijps8s2otr116rs4me/tosozitafikolusa.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a01c0caa34401c35dcd10d8282d52a52/rudulufuxosajuduf.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/wabufapufoted.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e8a5ba92694c07245126e062f5420076/roridemapamavipufumip.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea3e220d1e---jakodolonodekakumon.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736679b853f---96903788065.pdfIn PDF document text
    • https://actorconseil.com/files/file/dukupiwebirawivezupoture.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607aaea12f654---gogisedubezepala.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/84082242837.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26f8d808a---5339906998.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d9d233f8a1702ce7eaf919004a4871b4/23987863753.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/remajifu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b59638d9ac9---14038821525.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/wajuwikas.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c12366167---75634405792.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/eb9b96f7b33b83dc8141618bc4d215db/17231944746.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/79639930477.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1d5a71dcdc9a5f511fca5bee79683197/vikenagubakivafitodaruj.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/jck29nqjgrf36hsggd3jvfp7r7/xemuzanajuka.pdfIn PDF document text
    • http://angelsstaff.com/uploads/file/wusesunuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=glorious+day+chords+pdfPDF 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_off0002449d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2449D 19072 bytes
SHA-256: 341f03c0bd861fe2ee03e56dcccdcdc364bd62f4e145ce99860085a68d9f3b99
font_01_sfnt_off0002754e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2754E 10636 bytes
SHA-256: eddcb354a25de3bb6c708e8a60b5c975af12d43821b4fd087c3a2f5aaf9a29a9
font_02_sfnt_off00028dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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