Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10bcd71288efd95…

MALICIOUS

PDF

85.8 KB Created: 2021-08-01 11:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d510467ff99fb1bfa3e373392a42a827 SHA-1: a1507ee3d7387025e44d9620814ef245fd53bccc SHA-256: c10bcd71288efd95ba91c94d9acae99d4d172975616dc2b114698d98f401366c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The presence of embedded JavaScript and numerous links pointing to compromised CMS uploads and disposable hosting suggests an attempt to trick users into downloading further malicious content. The file likely serves as a lure to exploit users via a deceptive download mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc98ddf0b4969e67898c2db1554e5775/74141096161.pdf In PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/58125721317.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e04a7c8f0e---56106399753.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xuvajuxafinulego.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2977244004---wipufezafemimatolu.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/55857349139.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bca92d2ca---nomekinatedadagorirobizu.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/5490780425.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/43209673071.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075024c9b85c---62466639693.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070266506fd8---guxawolemefawem.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab013ea1a0---kiwatoguvubosutepufimis.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/judilesiz.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/85062090757.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/escs8l6ukveapup9m7m5jb13nd/xetigipojade.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uutb6mhj7cdnlhlii93hs0qd90/nukop.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sobisim.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/65178568561.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e0e50cbbd8357351c310ac66f5fc0684/80960682226.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/17183160444.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7g7j7ru8ts9pe702jbt4c96kma/rapuzosusuxurat.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/mepamo.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/7f39add4a7972b9140eef55ece218cfc/33870098514.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607040317cc67---47962554377.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e6dd2f1c0---43198541126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=english+file+3rd+edition+advanced+teacher%27s+book+pdfPDF 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBB 11384 bytes
SHA-256: 2176a43089799d9f41d1ab026200fd1b9aeaf6ddba51ce824718edddfb529909
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 18880 bytes
SHA-256: 08eca545ef5cbc7469c5d61a20ba6c0908fa4361d4d9f5f7b2db10cdfaf0424b

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