Malicious PDF — malware analysis report

Static analysis result for SHA-256 78213511b86110f5…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76e78ac906a2f0a3009d414e02e35d98 SHA-1: b9d391d0db93d3a5206eaa7aa209978a8a9eb723 SHA-256: 78213511b86110f5ed6e6d33fecf85863f31665b3ef63dcb256398b1ebe86e70
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many of which host further PDF files. This structure is indicative of a phishing or malware distribution campaign, leveraging compromised websites for hosting. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://healthywithhart.com/res/file/mubovuwixiba.pdf In PDF document text
    • http://hrzservices.com/uploadfiles/file/fiwabafejuzogutinos.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/73998867403.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d1d9be3fe95cb01b331d66019ffe07af/13144957808.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079064e2e478---83438522600.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/49146852113.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vvq8v3gfv1au25100dhbi9tm00/medewag.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/12613908342.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/47b93c7c110a7e9035eea091ad1dc3f6/xojekerarezezaxemigiv.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jawifimilirozifojimu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/96dddff06ca86c6a3aea7282bf95ebb3/dufodufizibuneb.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab490068e9---mokero.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e425beea8---20131242639.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/nuzivagaruzaw.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b967a6c5c3fc18c39c453e28ee75e376/ravozubozidikagedi.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ad89pvn2lbbebcmhuq20fvvrk0/basekol.pdfIn PDF document text
    • http://usateatop.com/_upload/files/vawozadila.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f2ffafa61---julanivijuduzuvodif.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/fdaf4b38cdc93d0b94fe64633a6feebd/lonam.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4479305065---zajetej.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160982b315403b---pumevajipetoxibu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/hlbnen67o83eo3t9l66mmadka0/dosuxiguna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=live+football+todayPDF 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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 10252 bytes
SHA-256: 917294cede89f751d0ec45e50c543df5fcfc79ef8dab6a2fc7f1614230a9163d
font_01_sfnt_off00010562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 17952 bytes
SHA-256: 73473601191f11038675b1dfecc3ccaa8efbac4c2b92b756015987df3cb9ea51
font_02_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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