Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87ca3c2784b9a07…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 47e4809268da803fa71370242064b87e SHA-1: 0d05241457794e50eddc3d31589d49b0848e3318 SHA-256: d87ca3c2784b9a07bade3f426e4a4b7bf992e4dc0717818a3e00215b4a607957
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute further malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The presence of embedded URLs and the nature of the linked domains suggest this file is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://aostavet.it/userfiles/files/32346976734.pdf In PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/1863202809.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/naluw.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lapifimodogozuxadozurexo.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210903104916.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/59163620691.pdfIn PDF document text
    • https://totounited.com/contents/files/talupesonevugobumoze.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/59040916307.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/19101075209.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/zujatiligofadonibetovene.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59befcc7e1f3a07ea6f62d87d1126340/jorenesejigofopulariso.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/33260827866.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/suxujakotidewikigarinoz.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/90888889382.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35942503271.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/jobejasatalovowekapup.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/famali.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/99217459437.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161377b5624311---14834022842.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/22003383702.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382e3a799c6---beliwalaxufa.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nurur.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/wevutenulofame.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/rimuzu.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/83688015768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grundriss+zeichnen+androidPDF 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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 19796 bytes
SHA-256: 545fba612b698f520e620205126193385ac84797c01e42663a3be043cb04a7f8
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 10520 bytes
SHA-256: 78f696c31134d9d6257302a46ea2ed86f657aace22bed17c073221534c1401fa

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