Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb1fb6d2d650208…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 08:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecb24a800f229efa064ba422f219d8a9 SHA-1: 3e06785cba6eb17e659296d9ef4b99f36d42751e SHA-256: edb1fb6d2d650208d228fa787822de03edd8606728bc07119466b19837aec34d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=beoplay+app+android
    • http://lactopad.com/uploads/files/23445158831.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/4paisl3f4hafhps364tra2f4l1/takapotovosarebexakura.pdf
    • https://siahotel.com/userfiles/files/57609968962.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/81196649500.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/28377797467.pdf
    • http://studiorinaldibedin.eu/userfiles/files/nidawugo.pdf
    • http://massvt.sk/editor_uploads/system/files/86429530949.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/dipulilusil.pdf
    • https://renhedc.com/uploads/files/202109010444105102.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/6831635060.pdf
    • http://vibrobeton.by/pics/files/34204212018.pdf
    • http://writtenmail.com/upload_images/file/77245520617.pdf
    • http://luxmeterthai.com/ckfinder/userfiles/files/kifodazixijizidev.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161454d4d3e3e1---40888189577.pdf
    • https://saglamahsapkutu.com/img/editor/image/file/29398607377.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/51400477435.pdf
    • http://intersonik.eu/upload/files/jisaweforalezalo.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/71712410192.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614330f8a5860---58254557085.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139be0d8ab9c---begalomunixupubif.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/91845274556.pdf
    • http://telecycling.info/files/file/98416483332.pdf
    • http://galettedesrois.hu/userfiles/file/16490239523.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edda.bin
cc5e89554f3792aa6b2271dcee2143033674dffd3218d258fbab4e2cffd50dd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 17180 bytes
font_01_sfnt_off00011a40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16792 bytes
font_02_sfnt_off00013257.bin
dfbf903589600e5c9f9e3ce9ccf98038f7ef6ab7b856511b4113e2a01b3a91fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13257 10284 bytes