Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb77593734e4ad54…

MALICIOUS

PDF

84.9 KB Created: 2021-08-18 21:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f0206085fb07a71e77093bfb91a3271f SHA-1: b2d3c13669fef976c22afb4f60e50f909bf1a5c2 SHA-256: bb77593734e4ad54226f501da4524af308b451df8f902bf7997186e739829ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These links are likely used to redirect users to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://inwebjor.ru/uplcv?utm_term=how+do+you+get+garry%27s+mod+on+ipad PDF link annotation
    • https://widerbet.pl/userfiles/file/xorujumax.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/4b1d04t6ff33gedjmj4q61qni3/dotafusesipepuzuwaziwodus.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0bcacbd9b---tutulivolobefun.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/61804984027.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/66175297539.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/92439086484.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/9775d61jikvnqgivp0c7jiqlc7/10235874917.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1609cc68d---65197642790.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/m9k9e2ben2s1s86mqrhu7piuj6/morej.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/70362052292.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ss396k7o36t4cp43jmvhfkpmgr/74015883618.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e5bc1ce2---zipili.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8e228c6a4753677fb7a2da962e8e52a5/mekegi.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/zinuronifewedileramopido.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210727234203.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080b98aa37e1---fevagujabepivuf.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/xukid.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/5503355243.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085691003359---kevidebusevupokizitunuwu.pdfIn PDF document text
    • http://htwy.com/upload/file/3302322101.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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 18608 bytes
SHA-256: 13ebdcdd6c42662d7ac6fb8ccd199e6dc57d811b3197d3a5e003002b791604f0
font_01_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 11012 bytes
SHA-256: 3c652b4dfb0899897ed713c0a0277d5af25d8917fac0e0a01bb3a043d41544b5