Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03b202b76db08f5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 15:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 249944f61ee2d2e3b742b01bfc908885 SHA-1: 31fcde6121647bfab3a0873ffb38f8e1f87dd2ef SHA-256: e03b202b76db08f555e70ff6399e312d597b5515ca3132777c91703e6001a9cb
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised WordPress sites and disposable hosting. The 'SE_REMOTE_SUPPORT_LURE' heuristic strongly indicates the document's intent is to trick the user into installing remote access software. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • 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://philabc.ru/uplcv?utm_term=remote+notifier+app PDF link annotation
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/83015190444.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/157638620613f671fb9076.pdfIn PDF document text
    • http://vce34.ru/attachments/file/29959249787.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/borukezokanukogev.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/95f8acfdea99481cbd0535254b1305cd/23314578618.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/50311977893.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/zotix.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/2604513368.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/vunesog.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/fotevowewosuparagi.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/tulakigetepobewuzuterudes.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/83483177782.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/14068705639.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/60613287390.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///soxabumixelinowikosezoke.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/xedurazujisusolok.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/dovonisedab.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b08100074119ec458c597d081800fb1f/fenapatikidisobisifedaz.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/mokegezomurelodumifare.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/97459966470.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/13de13f3506102a2636bac5c900a31b9/32130472403.pdfIn PDF document text
    • https://www.canoe.ro/Extras/ckfinder/userfiles/files/kikonazabipoluzuxexujinu.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/2438748561.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/67272941281.pdfIn PDF document text
    • 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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 18116 bytes
SHA-256: 69b5ea0337937d783f8e23d556d8efabd74d1331e690a580a892fc4c9b4e9e27
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10348 bytes
SHA-256: d9d0f14ea8406e9b357ae63304603d0e30e64e14fbcb3d07db049424d45274fc
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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