Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44ff8ec21c7532a…

MALICIOUS

PDF

76.8 KB Created: 2021-09-05 09:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b96ad470f8df6d5a5cc16fa643ae5cf5 SHA-1: 0a9b7a5fef15022e5a6d9ae426fe2b6a43ad9e56 SHA-256: b44ff8ec21c7532a1269fe5cc198b261292fba53df84fd03674cfdaa18416620
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URIs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://infrive.ru/uplcv?utm_term=lippincott+q%26a+neuroscience+pdf PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/dfcf09325b552a126567a8f4211b4630/nizamukeluzodena.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/19829293504.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007a4d36ca2---wanefarepusilo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a375c5264e3---zamerodeniwavopupudifa.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/52140798675.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1f322e77---40883911151.pdfIn PDF document text
    • https://everestart.com/images/stories/file/38374766299.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2874678b5---83249500125.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/59578274970.pdfIn PDF document text
    • http://e-district.org/userfiles/file/17882848744.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/23f91419a3e7a9198e08f861abfd39a6/33161721842.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fasavuluni.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zojuwemogalasimuzuzo.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/38143093154.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/pefiraxomiwonupidexa.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b186957ea---83645454831.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8087c946c1---49460516539.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/73415274340.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c5acece67---kuxiwemilamotaniko.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/43281513066.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/sugurekupixonosaxiboxotib.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/tinufibogomafeferara.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070956a9c576---72107983711.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/68274984280.pdfIn PDF document text
    • 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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 18204 bytes
SHA-256: b306de981e32cd8c67b7b106e7d555b55951aeada2ac8446e66beca454dd3d11
font_01_sfnt_off0000f7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 9864 bytes
SHA-256: 1df2c3e48232362c4197d43e0eaf4c1784a2219065ae2787c381319c366725ac

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