Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb0151f1c986955…

MALICIOUS

PDF

87.1 KB Created: 2021-08-07 12:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dccf6792cecdd8e383f250ef7ce6a59 SHA-1: a6dc4e4d4626f85ae5051364c273b60dc7279299 SHA-256: feb0151f1c986955a8e5bbb77badbcf5c5e8d2db431d230f7f67f3d321a5adb8
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to other PDF files, indicating it functions as a link farm. Several heuristics suggest these links point to compromised WordPress sites and disposable hosting, likely to distribute phishing content or further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://catamma.ru/uplcv?utm_term=bloons+td+5+mod+apk+android+oyun+club PDF link annotation
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ee3725da4580ec715bbb2b497ae109bd/lolasi.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/vipikoz.pdfIn PDF document text
    • https://limsurempat.com/contents//files/53579024080.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c12efd04---65715201707.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/laregoruwim.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160accb2bf39b5---81764078106.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/28428926134.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/32295114141.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b02467a2eb5---91165359506.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/livuwipisepo.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6520a474f---96394982931.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/fajaxib.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jelugowesajexodosomabi.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/81712414132.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fotajurelevowezadozok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0dc278e4---risomuzovagami.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/suzotojedixosunitimoxu.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/22806720640.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/49093683557.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/zipeligo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c748668d6c5730fff32dd56919ebfd41/xamakigedudemumiviguko.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/resozorusepizasu.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/donodezabi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607960dde7d8f---vanorowatidisipok.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/vaxamurewusumifedil.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f788c32420d6a978d4632a7d1b0dd7a1/zetojune.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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 18032 bytes
SHA-256: dde9cb73443bf721533dfff9e2ca02414fd07ca4d93935bd4ae22139a59c271b
font_02_sfnt_off0001320f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320F 11176 bytes
SHA-256: 0920197152e3741449c740095c72578b3cba92be7e5bbad16a97b3ace5efebdf

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