Malicious PDF — malware analysis report

Static analysis result for SHA-256 8988a0decc43f145…

MALICIOUS

PDF

100.1 KB Created: 2021-07-07 19:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 866682d831bc2f723c58623fc73b73da SHA-1: ea228a93ab3a2706344856b1d5a298e147aaa9e6 SHA-256: 8988a0decc43f1451b29b8f009c6f609e8615a7f58d904bd3a3338708f332cd0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the presence of numerous links indicates an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://allytemp.ru/uplcv?utm_term=mixed+seafood+linguine PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a32f0529---55842505664.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f7qoa7ep8fijj1ihtrn2l38ue5/99790245849.pdfIn PDF document text
    • http://sgpeo.pl/users//file/69537734308.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/medowemironeluve.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f90cee0a3---65643087386.pdfIn PDF document text
    • http://splogservice.ru/content/file/34142811864.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/30375307957.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/3a7464b372f28107d6193bac0a2abd8a/fogenuxoxegefi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/24816024755.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609276864c497---sorimexagalesolidexe.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/pekemulasa.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/megubefibu.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/69771130511.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092526987fcb---nulamiwokarovodakonopobu.pdfIn PDF document text
    • https://foulardfotografando.it/file/56669563275.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/81318761022.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767455c6183---16992593328.pdfIn PDF document text
    • https://oliogalanis.com/file/nimep.pdfIn PDF document text
    • http://desertofohio.net/clients/4/43/43f38f6e2239b09326489e1ba67fa1b6/File/vemuteletis.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dac25f77d8e---2508652598.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/73244675634.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/luzugonobilukutum.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec62431a3a---nowakogajofuxejujunafike.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6B 18224 bytes
SHA-256: 73973e8fdbdb69c7d46c068185bcbe681637579abec314de693fb221a6c31753
font_01_sfnt_off00013b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B85 10524 bytes
SHA-256: 54627a257510b5e1e521f89f4dfd21d49d21b1d837446d06c82b9c5471350bd4
font_02_sfnt_off00015364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B75 17036 bytes
SHA-256: 3ddae12b94ede42cf68237d77dbe64bd468a163a2148239938a006339844ba04

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