Malicious PDF — malware analysis report

Static analysis result for SHA-256 557db7d28fa1c19e…

MALICIOUS

PDF

102.2 KB Created: 2021-09-04 22:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25fc601454ad888259d248fb27832b82 SHA-1: 658ba8f5969d76917c43cb4d0e5c08fbb32174d2 SHA-256: 557db7d28fa1c19e27658512398c38ade05a0b18a9ca18579b99a15285d83da4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicative of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://eventaipei.com/upload/files/juduwejaxisusuwefam.pdf In PDF document text
    • https://n-vv.dk/userfiles/file/nirobadu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/zuxipu.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///dirosapafanexij.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/619bf6769a794783b316453197be1386/rediso.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fb30351b8b---ganixetarevud.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ddd8d4c8b1f0e469da2930db5a4bd7bb/45155942000.pdfIn PDF document text
    • https://chp-travel.ir/data/file/wanuroze.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/uf6rk93rhbc78rjadq5v1o97o4/zivevesedudepag.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160957ac2e346f---kafosazigujemejonasibeb.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/figududajebavisosek.pdfIn PDF document text
    • http://retailcop.ca/files/xuturufodogox.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/375902109.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e584bc4f8---17381200611.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210902120526.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/64367850379.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/resumikimetetizuvako.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/7de4972e9b9f2adbaf7b01d6da99f22c/85653702532.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/27409899149.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/37853729198.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/oopiol5gik12sm1nujdfgdum2v/33990241564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+conversation+doctor+and+patient+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9e990596b---30951382943.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_off00011f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F77 10948 bytes
SHA-256: d6c23f42d2f5609bdf69b918da14db34b7114e6bed2106395bcd24e239638e0f
font_01_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A8 22652 bytes
SHA-256: e1c5cf771a16249bf5d27cf2257663ebab43d544ce6af00d26d20ee5f05d12ba

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