Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee6390efe8b4064…

MALICIOUS

PDF

83.7 KB Created: 2021-09-09 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34ca0ca7b084244c9ecda094170094c1 SHA-1: 5ca1de7ce3cf081ab48d26f69e6c9488ed7cacc8 SHA-256: aee6390efe8b406453b995a82d64e866b5c3b2bc312f91a91a0072256c3a7f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of multiple external URIs and link farm heuristics suggests an attempt to distribute further malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cana.vn/uploads/userfiles/file/54710491724.pdf
    • https://pianotuningdarwin.com/userfiles/files/redojedanurodeges.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348abb66452---rebinuximezotisi.pdf
    • http://mydreamtuscanwedding.com/editor_up/rozorurulopewiwumuwibu.pdf
    • http://swotaweb.com/img/upload/file/64387570744.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/fidozaxidin.pdf
    • http://rambud.pl/uploaded/file/69303898014.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161329b5a6f874---taxutopifobajizixamebuf.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/juputowunodokebafegesiz.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/50177710223.pdf
    • https://mariapolis.es/ckfinder/userfiles/files/natomufex.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613933f977d8b---47384868492.pdf
    • http://amphorabeautyclub.com/campannas/file/90632015202.pdf
    • http://karate-talence.com/newsite/userfiles/files/duwevidixotopesolopokewu.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zupefolegu.pdf
    • http://papienbanana.com/user_file/file/99036793512.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f406aa0919---77058416244.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f54ae5dce---janat.pdf
    • http://kengosushionlineorder.com/uploads/files/nureraxivida.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/de1ec52565ba8c89d5656028be92c92c/xuzulatozutedegegugo.pdf
    • https://ncvpte.in/userfiles/file/51696343583.pdf
    • https://ecoverservice.be/gallery/file/74499244877.pdf
    • http://www.motionmantra.com/userfiles/files/nufoxapuzojasudiludunudo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bwv+1001+guitar+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_off0000df93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF93 16792 bytes
font_01_sfnt_off0000f7a5.bin
c3dbe6ea15050f93d7df4056d139f533f22fb499f6e50099c5c657e9336f6350
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 18672 bytes
font_02_sfnt_off0001290f.bin
0a898f709383f8924fa16b38c5cd592c8eb2e241a9b0ef45be18da669ce0bc89
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 10584 bytes