Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e24ce5def53dd7c…

MALICIOUS

PDF

86.8 KB Created: 2021-08-15 07:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 43e7b8a984ed7b7a79b78a55a0627c66 SHA-1: 320b6119f1385fa6626ea802749ec793d310a011 SHA-256: 9e24ce5def53dd7cddd1f583dd871e2c4526ff374896ea2dc920e8e6f75d41a4
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading further malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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 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 https://pistant.ru/uplcv?utm_term=outlook+web+app+download+multiple+attachments PDF link annotation
    • https://dnmpaint.com/sdcc/images/file/fozotap.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c320827b2c5---4255589555.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607946a9e8718---45379093841.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/25ab6f4b66a86c94b657d77d4cd14aa6/wesafulotiwefajuwufopol.pdfIn PDF document text
    • https://salwangurugram.com/files/zuvole.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/89948603804.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/18077559981.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xigadefupozopuzosoduru.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/24640845122.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e7d8b11e---67873760017.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/92993521748.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/safevepapi.pdfIn PDF document text
    • http://vizcsap.hu/files/file/pidep.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/defonizumamo.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/58545770160.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/wuputetukozezagasifuti.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/manunejaregiw.pdfIn PDF document text
    • http://totoumi.jp/upload/file/tosinowadiwilurifij.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/i9hocs115jjc174aqsb54hjefp/nobasavototikekekovuzujog.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/suxubutuzesixulasamuv.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210809024621.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609e63be95d39---40234205292.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/13218195606.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 11124 bytes
SHA-256: b3b62e779d98a6e2411d9bfc9c2896c35d41283fbe4900142ecedd6d2e5882ff
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 17136 bytes
SHA-256: f52933157764b07b1231e4bba85c45c06e3a85b13b81fa69bdbf1bd8ecbc5b50
font_02_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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