Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e56a66ad688e5af…

MALICIOUS

PDF

137.8 KB Created: 2021-07-16 22:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d3d3e4aeabff3ff16ac0b8c1fc5db19 SHA-1: 15575b0d10dbcf7ac3e6457eb7c0c6ef2817f835 SHA-256: 0e56a66ad688e5af36f544a19fceedb271eb6ca8e99df2975929a25cec4553b0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://kimwendelldesign.com/ckfinder/userfiles/files/rimogizibakejiru.pdf In PDF document text
    • http://arcomproltd.com/userfiles/file/39207363310.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2d4d092938ef24f532ff269c59282f06/mumutepuzes.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/51148008319.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8pd8vqogao9q9kfc5p0p2s8of4/bawimibuvonom.pdfIn PDF document text
    • https://pecsikult.hu/files/file/44657345437.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/88586375108.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a002b4c49c---2228039801.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7348c116---sofapijegibapevataj.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/59334519185.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/2991145319.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/xutigaregobotivave.pdfIn PDF document text
    • https://basisangka.com/contents//files/42871031646.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fk1752dfotslvmkk7t8gli0s1p/serena.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31efcda189---nemekif.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/lodabixanoligu.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/nakuwi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e63370a---85657254985.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9563186f90---rodosixufaxeravere.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160858ad200bc1---fipepasuwixujowibiti.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents//files/66535683014.pdfIn PDF document text
    • https://bauarch.bg/files/lezavowaraxutadagil.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837de8218c9---bomido.pdfIn PDF document text
    • http://nashcentralfalcon.com/clients/d/d5/d5bea9c86035def548a020f7371d19fe/File/76789835600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=node+js+redirect+to+urlPDF 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_off0001b915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B915 10304 bytes
SHA-256: a21cd01bfe5c1cf66e11223cec2c68669592667ea0c2b8df78f69d6797c78e64
font_01_sfnt_off0001d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E878 18564 bytes
SHA-256: 7071e1b0b26897958fc6eeda3b6b81df24ae77619a7eaf72543f827eb817932d

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