Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bb82e1699527cb…

MALICIOUS

PDF

86.2 KB Created: 2021-07-20 12:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fe0509e7da5993ca12116836370cb1f SHA-1: b6d75cf2f476c1cf1ed7188d3a58decbc71b9803 SHA-256: 88bb82e1699527cb3e75b39c80b66630ea2dbb752fe936dc11893042a4a4bb42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. These URLs appear to be part of a link farm designed to obscure the true destination, likely a phishing or malware distribution site. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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 http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4049c2d7---jujerumegod.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/74629436063.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/51996917103.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/58269851909.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/punuzalulazilekekuva.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a696695264f---bejugarorafetigelibarin.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/45822009324.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/18025221939.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jiginufiwog.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/80789548873.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f63c181ee---tobovitosedevarolo.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tawidusivujisijitupe.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ev75mh5od03juorurpme3v2a50/kufaledevokir.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609036d6640cd---57092337874.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/99040656075.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/378074d758a5d11baabaeab08e9b1990/38950014901.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2824265d8a---vafusolodes.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b010b14ca4---bogazejebi.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/47719688794.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/jusumaf.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/zawexemotibamot.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090057c7e07f---39061504274.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7b3c0fc4f---lukedugudenotazivegatiri.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f2d3e941---45851997090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=themes+for+literature+reviewPDF 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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 10588 bytes
SHA-256: 5ba015f5fb1be53c442991e258bc8b8a96c72bedd11b7b189030757f2b4c95fd
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 17020 bytes
SHA-256: 5fbbb76bd50a5f9b5ad478c9a5a4927931c06d465b28567ef337e4b32fa3de5e

Open this report in the interactive analyzer, or submit your own file for analysis.