Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f41665ce450d239…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 13:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6706fbe04874934c7ea705f542aa671f SHA-1: d540fba64270a08ff595892e529c9efb41009edc SHA-256: 5f41665ce450d2397aa663cf894bc73a493f36f49ccebadcb82c3cfe073e5ad7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://thegioichuyendong.info/app/webroot/upload/files/pinerofi.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16080e46491e24---jumolenujagodewevubofu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/1df10fbd095de3a6369ba88fbcb27d26/mowowave.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/movubebiwojogaxumamelasi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/na133op0grv1eai9sg9cdlnbcn/12346384129.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4571b65df---21318035318.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1326d2a7c---82845281236.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174b1ad6fd---tapidewofomuzitexefozal.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/29688186013.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/72106463383.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215201524434560.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6mvbs1vaum0g1kccn3eg5ngpcp/padusigexawalunugi.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d49e48fd9---66966046110.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/38939074520.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/98498876622.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/23245417523.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/m2fe4pj1tlqgro9tp5vn3q0pbd/47016045031.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/momobesaxizefageramom.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/muwibuw.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210617_214457.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160902f04673df---81324447973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sample+variance+calculator+with+stepsPDF 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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 10964 bytes
SHA-256: 36c456895bb14334d41d6b1dee4c489230a7befffd5da849172b2b63d1e56475
font_01_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 17500 bytes
SHA-256: a7283461a2a731a68d04b228fe3aa85da8c9127f3bb6bdf207692aa5fdd7a967

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