Malicious PDF — malware analysis report

Static analysis result for SHA-256 42343115f7401c48…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 10:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6972e37012b471436e3f71980ebdea94 SHA-1: 7ff44d17b9319a2ee0ff1a268960b64a25d5f34e SHA-256: 42343115f7401c48c74de4a8288cc0142030000fb1bf814c875d262e504b13e1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' in one of the URLs indicates a potential phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+to+answer+voicemail+on+android PDF link annotation
    • http://leeharringtonhomes.com/userfiles/file/63160579238.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/11759430051.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/33213271897.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kuruluxakoriset.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/88935764400.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/21058564934.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/wonajasokek.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/10956656806.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/2369831042.pdfIn PDF document text
    • http://hmed.vn/upload/files/lonod.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/dezesuvef.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/56296965152.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/10872530023.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/23908804707.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/76273930602.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/lokakupepumubav.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/rhqt1dmkqs8qf31bd9golajin0/guvotuvodoresamutugaw.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/18792708805.pdfIn PDF document text
    • http://vce34.ru/attachments/file/97678318517.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/potabarobawedara.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-5/20210905113639584842.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/62668aab87f7e3b60e3eea13293e72be/71967434350.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kolugitetapekixixo.pdfIn PDF document text
    • http://northcity.rs/slike/files/9316355580.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/nuwenevu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134a074a8452---46364803645.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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10672 bytes
SHA-256: 758f4b878de9201158554a002303619fd64bf9c37cd677fcb8612aac3ed83dab
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 18124 bytes
SHA-256: dc0018d495999bf1ce8da8519e7d2486be79304ee179598ae839b3f7c77bcf85

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