Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4974876423ee11…

MALICIOUS

PDF

94.0 KB Created: 2021-08-04 02:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e30c88449614a4ec57405636ef8888cc SHA-1: 592b162480a1c1154de51be1476ca8440f93030d SHA-256: 4c4974876423ee11775ccf7805dc0c7156d1cc4a108633473c791c664c9741ea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF structure and heuristic firings indicate a deliberate attempt to host or link to malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27c6d5d3f---19593850072.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e3bc40036b758c39f0f99fa491cac8f4/pidifopasisefuvitogevok.pdfIn PDF document text
    • https://csn-alliance.com/data/files/jumadiw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ed73decda---43918769481.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/34482465080.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb99bfe58---redogajirif.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/gezusitimut.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/64ch2tqdu73g4oanf2pgtmv1m5/88455634855.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/84274dfc8281a2435cffd9bd62e3a394/gajuxebanalefinus.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/xaloxozisokewaxukiw.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/jeberarijexakim.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/d236aeb3898577a8506344fb26b001de/pixaxob.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/417632729a0489faf54f75f05593a39a/34730792376.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/jisarulizukelot.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b76cbd41a---wizakenatuvosefemukipoti.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/wexugepir.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dusopa.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/43189074673.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce19460928e---78000206986.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/203f67e449b66009720547fd14c2a024/juwalozejuje.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/54358591425.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e47afa297a5ce9737ca3d6cf3ce03adf/wijujenomegilolusejidub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+roleplay+with+replika+without+payingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 10748 bytes
SHA-256: 5e479ec3c6e50a4c7098411f31f64ef3bd084c671d79cddc661d732a1de86932
font_02_sfnt_off0001233e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233E 17540 bytes
SHA-256: 1c286c0951ea9911259c049cfa0d49f9164dd2e429cb4d93b414fcc89aa2ae5b
font_03_sfnt_off00015101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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