Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e3dbd2ab967cb0…

MALICIOUS

PDF

89.2 KB Created: 2021-08-05 01:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fcc37a9c014ddfac57cfc56db2adf00 SHA-1: 10347c793cb4da182aadb3d1b5e03cb9d0b82933 SHA-256: 57e3dbd2ab967cb011a696a915dc45af0aa69582933b24289d7bee8f8166f600
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the heuristics and the presence of embedded URLs indicate a likely intent to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://advantagelic.com/singhania/downloads/file/79971705043.pdf In PDF document text
    • https://jxlmedu.com/file/files/20210805_054748.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/novuvi.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_013343_121.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/401f7a64c0c6a39913648cecb958cc45/tunevedukiketa.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/09047b0e41a2769641238ad72b096c3d/rowonopegexojaxova.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8b6040a398fc234002bcb07f4f03e66b/vajulabobegopovalenadimuv.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/maxasemimoboserem.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609564346f200---52753124157.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/71097901275.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/jizumetivekuxaduvomunen.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160881c9b63db0---kesavufizebafomivudo.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34b3a6d7---nujutezuzikupejuju.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mivuribu.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/ranoxudapunaguzix.pdfIn PDF document text
    • http://furniture83.com/upload/files/rixadudirikiwujutasodew.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6lpd60hof7v0l0edp5j558kvpg/tizogi.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/44700973631.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/zofav.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/15033287173.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/tufifatizewifu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f16a8a50c---xomomepajobuxigadiru.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1286e934---38358499349.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4a8797f810a7885260a5659e994dbeff/jimomedaxetatudowodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=why+is+moderna+stock+down+so+much+todayPDF 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_off0000f5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B4 18088 bytes
SHA-256: 427a59f227d999d1b90f53972688cb6cbf981825f05669376c0bbaf7ddfd68f0
font_01_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 10972 bytes
SHA-256: 97d9e90690b3ab1bbb6a6eb8c25504be591d2274b791d768e8cd772c15f6fbe1

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