Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0104b4a631b6f7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 08:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a643e4e4e7bb9ee784f34c2046c80cb SHA-1: 2537ca4aed8bf58304b0c1d7791e442651c67b58 SHA-256: 0c0104b4a631b6f7f208955bd8581a607768fd5c4c69636db23ce1d08c991aca
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristic analysis revealed it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=aplicacion+para+que+dure+mas+la+bateria+android PDF link annotation
    • https://lolakarimova.uz/ckfinder/userfiles/files/wubiz.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/zibudusadifofejizirezade.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/85987153373.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/75233250399.pdfIn PDF document text
    • http://nemochem.cn/upload/files/dujipowesi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f038106447---supusepi.pdfIn PDF document text
    • http://christopherdallo.com/file/50925182084.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303505e7f48---limadivoput.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/d94940568d75227eb1df80bac8b400a7/simotolonodovis.pdfIn PDF document text
    • http://iknow.pl/files/file/wonefasusutukisa.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/molixonibelobolamulopefun.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/telovupenepezituje.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/91848418285.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/xoselesiminilanefakugepa.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/nasewekokigogupamapovakub.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/7286997552.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vumipefomigajipakowizepu.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/24377185311.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55178538833.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/63350722938.pdfIn PDF document text
    • http://timocomputer.cz/files/file/17724913883.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613404f06880d---63114571815.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1777768671613b3b6cda931.pdfIn PDF document text
    • https://istanajp2.com/contents/files/nowadekunokanalivebifusir.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_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 11040 bytes
SHA-256: 5add00d901727384fe46f5cc4ab0716deea800741bb7db4fc0635900a31a75a0
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 18672 bytes
SHA-256: 37d97cc6b01b5dc7e920e8845648d8ace7e8eec5c3460e26fa2ceec4067aeac3
font_02_sfnt_off00012a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.