Malicious PDF — malware analysis report

Static analysis result for SHA-256 81893d0d062c0bbb…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 15:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71b6bc9e491de6a74a46eb69932ca4ef SHA-1: 554c926a192e6ee4d1311d2523f54820e5940617 SHA-256: 81893d0d062c0bbb4372ba424cb7920c1358115d7cd3de15507487babed77e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=l%C3%A9vy+processes+and+infinitely+divisible+distributions+pdf PDF link annotation
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679f6431f7---gabiril.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9075764c---lipopapakevuzibaso.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/pudowiziwodokodomegibex.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zimavogiv.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b6428c6e5b0b9ac1a0f35b55f1a544de/88515411986.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16117d0dd553ae---58623879014.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc9b034e7a---53966333757.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/vadurimorepo.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/48206654743.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa32b2d5---taxoruge.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/miloxijofomifukigiji.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/25604417513.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814b33a7583---62734577345.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/ruxipabetamasunoxazowebud.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/25155276710.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/77203670256.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16123c62fcca60---2710496077.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/dikazuvuweneropopokad.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-28/20210828141158859475.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160959a3d0cf9f---lazexatobe.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5714b2a5---74987515604.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/9kcndki8juasj1gtid2ci1m7su/rovus.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/vubijoserogizikemowukuzu.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/a4h49jjan8irh05pcgc9eegich/30824613126.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210828_9A04CCB3A8474CDD.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/241554082355.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_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 11144 bytes
SHA-256: 1bca20c5b85e5155aaee1c1f3e74c1a4c5b1f1fcb634a78a9888cc6ce10c445a
font_01_sfnt_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 18644 bytes
SHA-256: 42db1718f175d9f865493137566a6de275b712b9aec93172995a687cb27fbe11

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