Malicious PDF — malware analysis report

Static analysis result for SHA-256 45eaa53a31bde4a7…

MALICIOUS

PDF

92.4 KB Created: 2021-06-27 21:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc78097fece24c999156903d01bea1bc SHA-1: e2f00c1acab401543be794717313b5cb5fefe2de SHA-256: 45eaa53a31bde4a74f42641238c137e50bb77c50842ce04fc32575d0c9aa02bf
164 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised CMS upload directories and disposable domains, suggesting a phishing or malware distribution campaign. The presence of a visual download button further supports the lure to download a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://an-professional.ru/img/files/file/mebofivuzomevebufumes.pdf In PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/26836591582.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/tp3pde70d9p1b7dc2qcl6p8if3/fufopufubizilebivopulezir.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/d5a48ddefbc5afd09f77c2ffb2300d4c/43813996084.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608394cf2f9a9---47140451456.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/nuvojubotumujogi.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160831f8553b58---jezujapugabumulokofa.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/mewarulizunilepawezufir.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/pawivuzukitavabixusoseka.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/90884841591.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/lexufe.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/f58ea1af100b4686bd8a98639b36810e/kemodozafajod.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/eiat2jdges8bq8a7fckc6bfbv3/50334546969.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/87jpldlgd3eqgqli4uq43jt73k/4428500894.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/wojezitof.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/kudirodokenek.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a088ba0e---26766619195.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/lowojevawomutetuxarinip.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/33198721743.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0885fcee56---nafabufog.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ab6abbd6df32439544435505ae14e78a/lobedigadidivumefadovo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912dc20d61f---dotog.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609668df2529f---zinidegepo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098c58d52239---pimasab.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b16243a40b---jekozudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=george+kittle+and+jimmy+garoppoloPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 10944 bytes
SHA-256: d6463bbe9eba47ead4abdf33ddd40405a2b1f21853180aaf10104fd0fcdb2167
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 17936 bytes
SHA-256: f3a674407d382131405883c0bc25d8ea4676bd31a5ef78973b9745b43428c054
font_03_sfnt_off00014ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 16544 bytes
SHA-256: 66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27

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