Malicious PDF — malware analysis report

Static analysis result for SHA-256 1221e7794a0a87d4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 11:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ac392cf7a16d138a95b8672b2ca054f SHA-1: b4654c679a0e3616f86a5951806921aca7ebb3b6 SHA-256: 1221e7794a0a87d48cd3db539b571f1c5526477df813f0e8bc9da24bf5403fa4
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, some of which are hosted on compromised CMS platforms, indicating a link farm or phishing attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bozitufiguwezunubezabe.pdf In PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109051254466925.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/71334680139.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/nidekilava.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/69536466416.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/tirizopagefepesiluro.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipira.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/lelebutofo.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/kozoloxopox.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a8624cf229e8931e62b029925d109922/nutaj.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_044539.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/vapivakimefanilaxabolemev.pdfIn PDF document text
    • https://jensbrode.de/files/file/kepuvodusavatufitikin.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/84938796256.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/nazebobexase.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6ed19edf8285bc633335252ce23bc67b/kituvojefilizulinem.pdfIn PDF document text
    • https://solturism.ro/images/file/felevopomogotibawedenina.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132808dde704---tovixufiluzemena.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/74610091219.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/8012970638.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8cde49933ef1a2114f0ef10d20b46cfe/furoxefivijibopamanad.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/finus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=tongits+club+mod+apkPDF 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_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 18104 bytes
SHA-256: 2cac5deefb733a99441f1ec05a214b8ee2459541e6db54cc82fe159134db0a76
font_02_sfnt_off0001110d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110D 10920 bytes
SHA-256: 162a8b767861c52187a7b129b7f771e9e09aef269ada2e62bcb4589d20d62ab6

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