Malicious PDF — malware analysis report

Static analysis result for SHA-256 1553b2b8a7fd9fc8…

MALICIOUS

PDF

76.7 KB Created: 2021-07-16 15:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f722fd6d4907a22cf0442906ee8add9c SHA-1: 1ceb1a9866b001633810199630988d1cf310eb71 SHA-256: 1553b2b8a7fd9fc812ce0359d193268739ef1b6c5b4a5ca038b950aa9941132a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised websites, many of which are hosted on disposable domains or utilize UTM parameters, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns point to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://synerhu.ru/uplcv?utm_term=combine+pdf+files+into+one+file+free+download PDF link annotation
    • http://serramentisiciliano.it/userfiles/files/julagufejowabebikuwojeze.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c988e7e90632961afd94d00a0fc09c0b/4314224314.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/dewolulu.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b2edc640---raxumubopuga.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b11596ba6---49813681480.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a249241ec26---pisidakivonepenuragitibo.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895c08bcd1a---sokikuraz.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/jibavija.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/46940557212.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/65977413552.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607048d403bf7---zusodexiwuwigepuboj.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/32042885661.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca019cdb51---77967105621.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/dilovijuzised.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/1137555466.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/mazewitaj.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160da53d44d7b3---23764592228.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jmdrn976a5shts6nr5ebh592o2/kudugofobinofapajetoxeve.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/59000763456.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/lovolilofowuzulora.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/86856950133.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/82604905263.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/96649366438.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dde118234---75162725124.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kefopafekesujitiwotux.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/kubirenasazuwedanefor.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_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 10916 bytes
SHA-256: 05ebe17faf40d1b54f3b28625bfd90f029c22f872b014d5161b9d2a5afad9967
font_01_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 16384 bytes
SHA-256: 3eaf7e9dd66b07d0adabc41c0d3ccda812701c40dbc79f844b941ef66afa8a93
font_02_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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