Malicious PDF — malware analysis report

Static analysis result for SHA-256 4387fe3a38d6afda…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 08:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3a5df525f800f18c2e3706e47cc86613 SHA-1: dd2736ca2f501b66a2e57e383ca4de15787837b9 SHA-256: 4387fe3a38d6afda542650bf39349c2e8e4cecb82db281975d53d56eb792d06a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://oniceh.ru/uplcv?utm_term=nissan+almera+tino+2004+manual PDF link annotation
    • http://romengo.com/ckfinder/userfiles/files/wepenozikomigakusanufoda.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/48872457456.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/kotujefizorejanunisediwox.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/76541927788.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/xebapuni.pdfPDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kedaku.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/63cbe27b8dd2295a24585415841a3c63/39007213488.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/39087764841.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968f80d968b---25881131198.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/18138083675.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/zugobanoketimejabesixox.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/96989130046.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/gusosifisazovab.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/23568450801.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/10675272461.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60B84B68E152C.pdfIn PDF document text
    • https://agermag.ro/mm/file/58675634609.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-8-24/20210824161942479331.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/sunugonazimikugevoke.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/31983780193.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8e3af727---nuxon.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb466b4365---12271303653.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/91258936118.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_off0000d043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD043 10664 bytes
SHA-256: eea2b653d5b76ccde8b3edbeadead245731428121637fd8db147e6d146e7a24b
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 17412 bytes
SHA-256: 4e20a2f745aa7a66528153dc838c5163cf77bcab6bb437b7629a77d0180afa2e
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1