Malicious PDF — malware analysis report

Static analysis result for SHA-256 38de705576a24836…

MALICIOUS

PDF

90.8 KB Created: 2021-08-18 18:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ee19c830b08e9c7d01956305cd4b08f8 SHA-1: 7f40de903a57dad068d6751552ddd2ba983b402e SHA-256: 38de705576a248367ae360e21112d9f30291786b89174e7f5e35da85e12be195
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, several of which are hosted on compromised CMS platforms. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, likely leading to phishing or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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 https://bititechnika.com/uploads/file/zogokivevunixitiwezaruku.pdf In PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/51972468713.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/6k5k62b9fkl8bqp7hd73mm608v/84324665385.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/278c5801ebc41d41ef155af48043c0f4/jexuzepatinekaruj.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/kokobasipot.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080145aabb77---dawuvuzosot.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/patibelukufigekixedanir.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/5219558652.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/96982027789.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/13476900168.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/16375072403.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d53e7c754f2cd87defd29e1c72f46c55/ninulolalel.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/63719302480.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210613060353461.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/39204745156.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869005c1e15---nofaleve.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m3cib7ti72hpjed5hmv8ifh9i8/23945821231.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/lekarufemorolediwobupowo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607369adc1634---9235180161.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/76427717080.pdfIn PDF document text
    • http://anm-av.de/uploads/files/51966826068.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/tixugikuzedakavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bar+menu+templates+free+downloadPDF 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_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10804 bytes
SHA-256: fdad6c815c835932277ae1dbaca460006a727692ca5ecb8208d7da7b81754d23
font_01_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 16852 bytes
SHA-256: 49db6d37b12dc65db7beca4fabf67c21214ba005c4a8eb09762516a7b20a0346
font_02_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1