Malicious PDF — malware analysis report

Static analysis result for SHA-256 28383566fe4e7206…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 01:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61ed4e9d1ded0d1acf8607c732ba0979 SHA-1: 1f04bdb2135b4b87c64d191c2b743e6640add1ce SHA-256: 28383566fe4e7206d4895b4c4ebd641c87ce112ae120b4c3b76b78a054a0490b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a 'Download Button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://banglatalkies.com/dynamic-images/cms/file/47096607826.pdf In PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/zagizomevataneboluxenizel.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/38b586cd0ad1e77c0cb5777ed2290ac6/nezoribeba.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/02f0a974a0e0c50e09ca07a5c6efb553/liduzeta.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/noremajitozanotuzigefomaz.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/duxeloloxarubokakubopaduj.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c992b48374---nitov.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e14c85a6f06fa41844f1db40db920453/72543310174.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab769a0546---pudusamuta.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/temafejorozulebezosilu.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/53762491216.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6598b55aca26863e7fcafac21bfe605a/37142054648.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/vojajedoxebanujovusukete.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01945c33b3---81695667610.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/39949754943.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/nefelifokukonuxapen.pdfIn PDF document text
    • http://arslanemlak.come/file/gokanekalemotazopizelu.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/xawarerenika.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc07298beb5---6995363541.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/85134133150.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/gukap.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kutopopenipopivofufune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mengubah+pdf+ke+word+offlinePDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10920 bytes
SHA-256: 093ca4a110e713aa4814c8fa61e3a3f5ab91afcbee5a09eac0ec0b3fecc8f9dd
font_01_sfnt_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B86 18444 bytes
SHA-256: 8821c6535561496a871f2e665a357a8a54d074a3fc8131c220eed5fc7f0340cb

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