Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dccd52d84b1de78…

MALICIOUS

PDF

87.5 KB Created: 2021-09-09 17:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d9fef012016761dc116f7a9e2596ec3 SHA-1: 29ad7509fe979bf3704de912f16c0912f16832be SHA-256: 0dccd52d84b1de780fc6cd6ef5c2b32a25f7e3e83dcb4d8d526de36e7931aad3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic firings and URL analysis confirm a pattern of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=lulubox+free+fire+skin+apk+download PDF link annotation
    • https://fajanav.com/aym_image/files/78661995238.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/supanosavi.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/bijusejutenobemakixok.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/dobekunukilola.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/72472520591.pdfIn PDF document text
    • https://faceless.me/userfiles/files/ronuwe.pdfIn PDF document text
    • http://pedraferro.com/files/files/rasenusuvutazawiwosukimak.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dopajizitumamof.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d2f8a6161---regakidusiwitunoxigo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/xinikebawexojawobetededux.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/jatatafokujakepulome.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/rurulinadimifodu.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/polajuranokaru.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/19244898073.pdfIn PDF document text
    • http://nessium.net/userfiles/file/tekisozuge.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/tugoduwa.pdfIn PDF document text
    • http://skolky.info/foto/images/file/40363043830.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/mesaxu.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/579b3722adcb04a5bf759c1dc82e0050/84595880071.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/jabevipitifuvorosirixara.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51ecf3b60---watore.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/kemafiwogupadazirebosewef.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f027fe1294---61157232574.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/zugexadiwuwajunexiliwe.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/43006779236.pdfIn PDF document text
    • http://boki.hu/editor_up/95290527837.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/2711549404.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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 21428 bytes
SHA-256: ebc83cf10c3f6782892817bdd282be42aaba68633fc04ced0bd1006fae54b4d8
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A3 10868 bytes
SHA-256: 5becc67cabcc56104ce132dd2e5f3321d5353409df68c43ce0e537cd1aca15ce

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