Malicious PDF — malware analysis report

Static analysis result for SHA-256 5645aa16b99a42c5…

MALICIOUS

PDF

132.3 KB Created: 2021-07-18 13:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bca14075d2c191330d45bf0e83053d84 SHA-1: 45aacbaef5d5ac0db8b4480a3a268f24df6e5fc1 SHA-256: 5645aa16b99a42c5a0b646512ca3f0d59d4d371f3fbf6b760ca0e3c222cc6dc8
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 CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a69239c25a6---26657472752.pdf
    • https://locktactyuma.com/userfiles/file/borevugozarozawebexevevu.pdf
    • http://aihyang.com/userfiles/file/puxulamot.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd042f388df---10266157686.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160745454bfbd4---5365400736.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/19725851032.pdf
    • http://starinviter.com/ckimagefiles/81366374718.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c5130b0db6c---38635515770.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a669d9dce53---8410495470.pdf
    • http://cedule-plachty.cz/files/file/36812993837.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mnd2sgtu9r87hv4j9b70qfqch9/zukinurizebabafamibe.pdf
    • https://actor-conseil.com/files/file/40265763074.pdf
    • http://challendor.com/fckeditor/upload/file/1560526696.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/gi14keq2mdbqct952dofo8hl0c/bapuzoj.pdf
    • https://cahayaapi1.com/contents//files/96653439503.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/82421703918.pdf
    • https://bobecoingatlan.com/uploads/editor/file/bawivov.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d0ff8e2bdde0cff8982b56407cbb477f/7236116821.pdf
    • http://glovimex.com/uploads/ckfinder/files/24548984489.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b349c37af---tokuximibipivuzimuk.pdf
    • http://myphamlulanjina.com/upload/files/refimonizetelibol.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/98410690167.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef73189569---figulu.pdf
    • http://www.findvoters.com/userfiles/file/kegerijezim.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965bdba3a---tiliz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+games+of+all+time
    • 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_off0001a632.bin
fe0bc7f33ceee8f1e25537e901c19589e8a73a93b4ae90ff3cfc0b75781493ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A632 17436 bytes
font_01_sfnt_off0001d3a9.bin
52048a3ba1dabd2ad8eb2112439bdab964fc93d79a03001bfb01ef4e91d61809
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3A9 10404 bytes
font_02_sfnt_off0001eb51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB51 16792 bytes