Malicious PDF — malware analysis report

Static analysis result for SHA-256 05690d0bee55c449…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 05:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3f243dca856212caf8cbc00eb612dac2 SHA-1: 72aef76606a509b0df357d4a3fc97fd68ea5b5f6 SHA-256: 05690d0bee55c449eee23fc48eca721345432588d3dd968c7e6d86353608d27f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc973ef7c---luzamudaduxafonazetizizuk.pdf In PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/7656504958.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fec6e6665---30874724145.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/91241626.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/femometawivagewax.pdfIn PDF document text
    • http://waroproject.com/file/73633731395.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/wamebat.pdfIn PDF document text
    • http://bakoca.hu/files/file/91198898613.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/85497014159.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/51196760685.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909c1164416---92208528172.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/2605092137.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/lesizefogowupujosevo.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/52726080975.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eae279e43---76590278390.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/74197444369.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/wizolixuworexowigoriw.pdfIn PDF document text
    • http://waypl.pl/upload/File/sojujusesepobetusagiwuvij.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26017bad0---47889973235.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5beb61f4c7---rakirorode.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba31ecb854---66903687832.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/rijal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cool+pokemon+wallpapersPDF 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 10432 bytes
SHA-256: bf6c19055bcaa8af4fa5aaf45108feb762594641fbba7ac9b9312b73c8df8478
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 17268 bytes
SHA-256: 53a3ac1953ca389432eb2914f612945068a774e0b3f631c102edc34a088b2bd5
font_02_sfnt_off00011f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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