Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d896652f52dd66…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 15:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adbfec2a7d239b25ef54a31de6d4d7f8 SHA-1: 0d3aea49e3c4bb09425d702c48f314ed10a38b12 SHA-256: 04d896652f52dd665d8c714178f9de8650af6358fca1758fd2ef70496e058308
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to determine its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/t4b2h4kblf2qdkrh4b6rr2ltig/85565032742.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a0320605---35519955629.pdf
    • http://marchmont.ru/imgs/file/69026344617.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/95508555955.pdf
    • https://ddshower.com/ckfinder/userfiles/files/nopuvibub.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d91ee510702e1395f4e355680aae3961/xubid.pdf
    • https://mumegram.com/userfiles/file/dasoz.pdf
    • http://come2menorca.com/images/file/59815674325.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16086f7b344bd8---55871218583.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc667784232---bamovulezuzojozubi.pdf
    • http://nakajima-ya.com/upload/save_image/files/95561647518.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/937e3f351e03b3f714a35acc093892db/39914045201.pdf
    • http://lezeckastenakosice.sk/upload/files/puvigafudagawiwepume.pdf
    • http://mateuszkucharski.pl/admin/file/fasulujubuvitamotuv.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97691e04a---zotofodasofalewoto.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084188bca44b---88526432473.pdf
    • http://cameranichietsu.com/luutru/files/92406324352.pdf
    • https://tarsiman.ee/files/file/63410823503.pdf
    • https://sabagdasarov.ru/upload/file/73904896854.pdf
    • http://soft-pro.hr/upload/datoteke/78282983072.pdf
    • http://nhakhoauytinhaiphong.com/upload/files/pezutowamoruvofusimef.pdf
    • https://bawwabatrizq.com/userfiles/file/71189855340.pdf
    • http://kbo.pl/ckfinder/userfiles/files/79375482259.pdf
    • http://gibisch.com/files/files/27074662184.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=sepsis+guidelines+2012+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_off0000bb8e.bin
67958d8beff23ad896471d7f62bdfafcfe844fb69d341f227a52f0054aa0777d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16180 bytes
font_01_sfnt_off0000e55b.bin
8d806758ed0dfcce0f17d5d4ba4f0449ce1f8fb0ceb69827cf34152b3032bd56
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10664 bytes
font_02_sfnt_off0000fdbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes