Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9091bc906724a8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 17:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85fe2c005f48fad1882abe2e414afbc3 SHA-1: 54f13d773d74ba06d9fdc62d2a85309ce89e998d SHA-256: db9091bc906724a80aa51b40f5643590b8ec93f7c735fcb35da6902a2a3e5cfa
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • 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 https://pasarangroup1.com/contents/files/zuzevuli.pdf In PDF document text
    • https://masukpt1.com/contents/files/nafidonorupap.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/19376016939.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/9180476791.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/72058784253.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/68607207663.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7f95d2ab749300c028bf9db208f2859/falifavokozarug.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613240ce179ea---detaserama.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/renuv.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/74310695451.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/silojarede.pdfIn PDF document text
    • http://orlickachata.cz/files/files/gefaxapemujatuk.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/69513228154.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/57252480529.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/poxexevevufedofenejenuru.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/30681199206.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/nozefes.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/pilunafewavizab.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kabikubamaputagikudowo.pdfIn PDF document text
    • https://shibbirs.com/media/files/tinudanijijemibugogalo.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/zefovupamaranezuforus.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/xukumaguwotuwagazi.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/51929647265.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161370e75454ba---tutipo.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/regejenunokabafak.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/58017268123.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/vojul.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16135267119035---kuxetexefivegison.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+make+a+ringtone+androidPDF 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_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 17128 bytes
SHA-256: c2490c5369eecb8e9cafb2af4e24eb691141013a5306a86a442294fdfbe43c72
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 10544 bytes
SHA-256: 4d103b8c018b16acf192a3aee9c391b9280a5b43ad260da12e1e4755071617d3
font_02_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1