Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0a0a17773a22e6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 14:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23a0788470ed27473cd708ef9e127c42 SHA-1: 3c79257423b53d8a1c2b9dc8f7a87cdf17f7dd42 SHA-256: 6a0a0a17773a22e6f709919eefa0ac0760c4128645c96449eceb7d57692c84df
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, designed to trick users into downloading further malicious content. The presence of external URIs and the overall structure suggest an attempt to deliver a second-stage payload, likely exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://otterdisplay.com/userfiles/file/88287969896.pdf In PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/nobiwabakesivifivo.pdfIn PDF document text
    • https://satesayap.com/contents/files/gapobexije.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/xirezo.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/nidoxugubipemipukow.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/gulobime.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/4504741936.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/27704088087.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_084612.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/tamalozedibuzireve.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/misinazemonexiz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea14d562f5---xejuvuxolilun.pdfIn PDF document text
    • http://flomojapan.com/upload/files/lexage.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161313135f0c41---ronijapexolesa.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/zemokakafo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d68e9f57b---benipizifovonojema.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/xurusojuduxurafinekowa.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/mukerosilemokatugapizu.pdfIn PDF document text
    • http://haki.vn/uploads/files/37772820048.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/45142880530.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/57745933390.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/zedetevimi.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44539026172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=parallel+space+full+version+apk+downloadPDF 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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 10860 bytes
SHA-256: b670ddcbe914fbe32c3e22372b844abc69c3176359ae6674f55fe31c28a7c4f2
font_01_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C1 18932 bytes
SHA-256: f842649a6c904646703d80b8d55d57a32d76e78b2f3c8e0c382ef0b6758b0c59

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