Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef52aeb2a7995a0d…

MALICIOUS

PDF

85.5 KB Created: 2021-09-08 22:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c20c671e10dbe500f72a9cf8f138f09 SHA-1: 0bcdf23a64d2afec4debdef8cd37055efb219047 SHA-256: ef52aeb2a7995a0d27609fd78a86d3a97735376b399f63e32a6b706aa0627f2b
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting, likely to host or distribute further malicious content. The presence of a visual download button lure reinforces the deceptive nature of the document.

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://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce96c34df---82405501037.pdf In PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/boxasexut.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/robameta.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pigowiwupobut.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/riselumamufasa.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/vozirupiziza.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/fisiwabunasewak.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/wunusoxoputidefiviro.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/fogub.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/62674919749.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b5359197---jegulagitawanaroxorijem.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/nusikerutaxot.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/92654487776.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/kukumalu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/vosewim.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161371c2cccf18---30397912527.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/jowet.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/44621162290.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/kewafilupawu.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109052224063644.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/zololalilojebodimev.pdfIn PDF document text
    • http://grandfiltr.com/files/file/68064811468.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nukijoxitoxemifelovororab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hack+android+phone+using+apkPDF 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 18800 bytes
SHA-256: 36756b6f5d0b5b40be0dd72b2feb32ede75a8f576639c552f2a4c946b2a4bdcb
font_01_sfnt_off00011824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10832 bytes
SHA-256: d5884a601781760518280cfae0301fb494802d26c05bb9a6e25164fed85e582e