Malicious PDF — malware analysis report

Static analysis result for SHA-256 068009f4cd9dedda…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 10:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 068b0534a2974a3841bae28931fb82af SHA-1: c303eaa9a6274b9274b4047db39be317ca65cdcb SHA-256: 068009f4cd9dedda82a33691e9d277d9225085a3026a95f6a9ffb5bbd36082e6
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to compromised websites and link farms. Heuristics indicate it's a link farm on disposable hosting and potentially a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=major+chords+scale PDF link annotation
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qvj5kf162jf5c3a1jnh9qv0stk/85467400011.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad474e85ec---34664083545.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/44145699866.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357e35d31d2---96148552542.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/xodixomoropimuzonom.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/48714978516.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/2433399181.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe15e8c3c---68354492332.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/29433699375.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/41612734776.pdfIn PDF document text
    • https://theurbanthinktank.com/files/danarumezigurenafeb.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202195956223952.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/majugaxatugozajukuwe.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/bobogowoxepidizi.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/geworuduxalakuwilak.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/gemijonij.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/tiwefuvuxexodep.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/43544494333.pdfIn PDF document text
    • https://uangraja.com/contents/files/89765441756.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/gepumixetodadawi.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/54740812232.pdfIn PDF document text
    • https://haidangpc.com/contents/files/roxonir.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/48770610216.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/lilef.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_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 19188 bytes
SHA-256: 2becb927d78a347c2aef6c1155dc0b700ebc7ebf0305392b9343f694346a1754
font_02_sfnt_off00013560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 10296 bytes
SHA-256: e629d8501de8ff78966b3c797e95d40cc857860a568f170adda50d8df6c22c48