Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f918c354feb95d9…

MALICIOUS

PDF

86.0 KB Created: 2021-08-29 23:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30bb0ade8a07c9c48ce4a0f4570ed5dd SHA-1: babb897e07327f41d2b66f2f7e4f229d904b3db9 SHA-256: 5f918c354feb95d931fb7be767333231f496c2e15b1efa4c7509eccb9a54ce73
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e40cf80adc9ab607b6eff550d3af3067/vuxukezo.pdf In PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/82269333036.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160848d7dee304---pimofinonobijabadejar.pdfIn PDF document text
    • http://geose.ru/userfiles/file/xililer.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/varobogodebukip.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/25877410316.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4f06pcp5dpp8vku2585m4tvkfc/40981045449.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d43ad2987---93093117494.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/1194945226.pdfIn PDF document text
    • http://www.polni.si/Images/files/78508724816.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bigibonar.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/70654059899.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/zogelapazanex.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/91949117240.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/82605212872.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0md2fvl6so7e8c5lhn1olqu7l2/zugetaxuvo.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210728_673CFFD50F8C7E7F.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/94573b2b2a14a5c49e83352926eaef8c/rinenakilajasoxipawu.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8ce062ce---7778675245.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/tidofosugisep.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/bomijob.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/nawivotebibadu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=magic+protection+spellsPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/fa80fd31e2393569353c7f22b5396b27/13475294322.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_off0000e9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F1 18420 bytes
SHA-256: e01bd59cb5e25859c84f7c92745c4004dd80506799f13aaa62a38760a053226f
font_01_sfnt_off00011950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 10540 bytes
SHA-256: a71209fcfdb60abeb80bcbbef8839a7004825c230822bf1b6648d3156c395d24
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1