Malicious PDF — malware analysis report

Static analysis result for SHA-256 88049ec0ca313ed3…

MALICIOUS

PDF

78.3 KB Created: 2021-07-28 13:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 213f897fce07f4f8976194ee2b56e8dc SHA-1: 52d23ad70b84c06308827ad4751d21aa12bd4556 SHA-256: 88049ec0ca313ed3ed8e3682328b0c997afaf7a92df69a02b34152f60714fcb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves using the document as a lure to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • 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.
  • 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://smartcirclegroup.com/userfiles/file/gexekuragesawumose.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cfdqp1df11ckf0mo1nqv3n7sd3/mixepikenisamixigez.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/b330e9e4868e4f8719f68580587126d0/zadekusexudinibeparotare.pdfIn PDF document text
    • https://isosklo.cz/uploads/mutogig.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce43e8b8e7---90348645069.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089acc3506d1---nipowazi.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/72e3f45778b2baa28d1479debca18ea5/44198406159.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee69ca451d6---67924962974.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jagube.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4c1a560f---bamobitugaj.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160801f46c277e---sorujekegijudatatapatir.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/93voejakc21iq6on120r1jmee1/jugiwopowonekoripu.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/totupeg.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094ffc33aa30---23484049656.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2d16fd53adbe8cf81b79a038708547b8/topugibozujixepidunozagaj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a0acf851---rimaso.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/42511652486.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510040014585818istth6.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/7171273135.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7gi9s6i5e8k55bcia62sebi0ad/41334378412.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac72834d7---fikoxudid.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/i5srmcv2kko1ah82o3b5eck9gb/56885657757.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/o6e8mnpdb0a6sksip1dfo5rgjb/24585496588.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/92b6bea17195b53717f7f893b6ebecbf/pawemazize.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/jumujor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+read+a+motomaster+battery+chargerPDF 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_off0000cfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 16064 bytes
SHA-256: b5c59c09e64d31fadddf28b07eb7cabb5edc3319ef11250560e49c6de8354707
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 10904 bytes
SHA-256: b93eee5bde750e4d3f9b994d27295910fddd1625c719094da89d5c08aef53ebe

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