Malicious PDF — malware analysis report

Static analysis result for SHA-256 377c5e66dce2e825…

MALICIOUS

PDF

93.7 KB Created: 2021-09-18 22:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6047de30b1e8a42a70bfc2a3489addb2 SHA-1: cce8ed271a54626d776a42e2a657bca255e73ce1 SHA-256: 377c5e66dce2e825f535a32c0605d906ef014a306b67a7bab03c6e4717c51622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate effort to obscure the final destination or to leverage disposable hosting for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://wastran.ru/uplcv?utm_term=secret+love+affair+full+movie PDF link annotation
    • https://qigoodteam.com/uploads/files/202109070029594216.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f92bca400bbdc7460c416343dec13dc8/jikuporolomavalugevuw.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/8264290687.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210906075644.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-18-08-07-02-55.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/zinevaf.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091520958_175815004.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1a1a2ac---45005541594.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/xokasizapapas.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zutudapexovuge.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381ea24b5b6---meroxinupo.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210901130644.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/kevesanok.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/30897566940.pdfIn PDF document text
    • https://andana.us/files/files/65438448544.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/47908944488.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161312d067074a---zelalerexajutoxowabejax.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/18174099653.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/paboxidif.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/powofinesefupezemonev.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/275edacdd46ecf5738ae0a7660836671/jasafetip.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/19098664519.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/46414441769.pdfIn PDF document text
    • http://limoride.net/gallery/file/27103637944.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/96216785007.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/paboxidupuluxas.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_off0001061c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E33 10464 bytes
SHA-256: 220cfa5d1d3ff03b2f64f10f2937307b27f5d9de4fdd1ab1acac06db862ba3cd
font_02_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 19932 bytes
SHA-256: 1a6feaa174f7534f0e594ff6dea38ee0a9149179319d278ffa7afcdf1e903085

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