Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fdffaa84f261610…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 13:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec1858eabfaba7854ad678cd2e2ec3dd SHA-1: 593059a5ee19e2d60047a8cb49fca60e210af00f SHA-256: 5fdffaa84f261610865c483ae1dea37cbfef5e94d81d94a61dfb7b03a0d4d278
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cn-junsheng.com/upload/file///2021816111517290.pdf In PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7215ee8487---46098467246.pdfIn PDF document text
    • https://datawire.gr/files/files/99569666918.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/lewixamedexoj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8444f1872caf5d9316021647e94233cb/sudexefonifexadutimap.pdfIn PDF document text
    • http://saydersan.com/firma/files/96868050111.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/63440177189.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160b78730000a5---51638823651.pdfIn PDF document text
    • https://visualarchive.bg/files/11489044024.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/nuzikojuxemuratofapuwixex.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210708_9DB36F564FADBFF9.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121761634d02---jebakulafenutap.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/xisasizijirojanef.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/70287636534.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/sulejowesu.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/nekiroruzukewimikiwi.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jinebekanosojixa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a117286f62---67194607135.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ac0d03e83---potamu.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/13058099148.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d8623adb---kavubufoxapun.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/19230689353.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gefadusugewaxuxikobajoba.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/79748615026.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gufufa.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ea1ca4f4---3259735780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=define+pathogens+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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 18428 bytes
SHA-256: f09e7e672b6af296e5422cd75b3e75d6d1eba26ec77615ac60371790381cd450
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 10632 bytes
SHA-256: f93bd64414b0d9da6fb9b417d433683d94891db266244330493e88b55ac7251c
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1