Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f1e78a2afc9d26…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 18:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ebac28f967d31c2e331552a82a14d8c3 SHA-1: ef8f801d8c1981fa85a4f29b49c9f8c9dfac1e06 SHA-256: 74f1e78a2afc9d26dbabfebbf03c216956e2ebee378f67c8773be486d8843fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content or phish users. The 'wkhtmltopdf' authoring application and the presence of embedded fonts are common in PDFs generated for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/nbc8vtju8df44h2c431kqtvha5/64676126111.pdf In PDF document text
    • https://blugarden.eu/file/81900366129.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/xixifapotodevevivojetidu.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/28264034412.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/86588018103.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2c8f17f9---xusotuxafolotodidixarabak.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/76216141055.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/risejidawosexodo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/gaxubujijut.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3e48171b0---35968058571.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210902_F7EF374A8B3806B9.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/mifunagubunimapora.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/movul.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210803_CA14706AC8141E51.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eac8916c8---jepemuweribaxovasalesi.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/88510389864.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9h6rl4ttet55hgtvdtdmp7snm1/biwuguwomuge.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160715f92bbfd8---18626492883.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/foropetomunejemaw.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/0bf28e0fd0a19dc618a1d05e1c3ee1dc/muzoxeketemizawabonize.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210706184728.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/68209257281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=livre+anglais+traduit+en+fran%C3%A7ais+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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 19728 bytes
SHA-256: ac727246883626faf837fead5a6b288568dcd7dd3428ed93dc72717068983e60
font_02_sfnt_off000131a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A3 10876 bytes
SHA-256: 1309c8e749d6f98e66a4eb5900498ea65c73f3cfc92a5340e19cc52202710653

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