Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41827c59886ad7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-26 05:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b84ddd48fd9ca522a0112b67082f0b16 SHA-1: a1d28d5aa8b710c7e18ae612132e51c75a3ef3c4 SHA-256: ca41827c59886ad76f1fe14dbcd7ed1a07751c0e62fc5ef8b88dc0982c129163
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of PDF-specific heuristics suggest a phishing or malware distribution scheme.

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 http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145c5f456e38---fudopete.pdf
    • http://vangphutai.com/images/uploads/files/51499376314.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161462b0929d39---razokefezijagasefip.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed548422dc---41930434577.pdf
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/3069000812.pdf
    • http://ch-yang.com/upload/files/97710922901.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337ab80bd4f---52549776322.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6cb140b6---56125406595.pdf
    • https://arabadvertise.com/userfiles/files/jugulolu.pdf
    • https://tranhdaquyhn.com/uploads/news_file/busogapejovo.pdf
    • https://sonerofset.com/userfiles/file/lejijidilorasejaruwum.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5290859af---49484925516.pdf
    • http://adas-muko.pl/photo/file/5370969329.pdf
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/sawowas.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/56254587162.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8466d5ef0661416da67157b3529a884d/vojokinimigubaka.pdf
    • http://law885995.com/upload/fckimages/file/96477420534.pdf
    • https://educhina.mn/editor/files/8872018885.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/momolifakarovupamewijaxa.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a3777e2c---54861303459.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/kevimajidesovexek.pdf
    • http://fonnepal.org/userfiles/file/xiluzowumusekozigedufuju.pdf
    • https://warungmimpishio.com/contents/files/figixezukilep.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/topujakepuwotujimuxipoxa.pdf
    • https://canionglobal.com/FCKeditor/file/juzejalupuxejisubop.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wav+file+app+for+android
    • 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_off0000b8d9.bin
8c9c51e55b53bb1492435bbe3c4c75f34e4b8daa6a7c09a7c720448e9ef467f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D9 10284 bytes
font_01_sfnt_off0000d00a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 16792 bytes
font_02_sfnt_off0000e81c.bin
0aa9120fd35097cf8f44d3e1465d09fffba2a6b47c22da046444ce06cf10e270
pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 18492 bytes