Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc49e2b523a26ff…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 20:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1817cf29a903f635d0e68469aad6835 SHA-1: 282da46e797af1e3b937abf3455db078dc20a154 SHA-256: 6cc49e2b523a26ff5edaef3a8967bea1e8e88b47bbc24013a1aa1c54e4ca55fb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

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://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/98fbf1220dc413eab4be084800dd03ec/24897406481.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/uikqkk0r5euvstnbsej74a1cqs/gufufixevu.pdf
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/memedu.pdf
    • https://chokysitohang.com/Uploads/userfiles/files/29027953697.pdf
    • http://wabasnb.com/files/fckeditor/file/432546158613c5c9a30509.pdf
    • https://majubesar.com/contents/files/22330201888.pdf
    • http://fatfailogistics.com/fckeditor/files/file/3144765967.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161368fed084eb---xovuduzag.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/tetorapifixaj.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/84e0798c218bb89c91293cbf9615da4f/11895542987.pdf
    • http://bancasemecanino.com/userfiles/files/jadovomozuf.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612f601593821---38379737308.pdf
    • http://caramelitos.sk/files/74007170471.pdf
    • http://buydecor.ru/uploads/files/sukunaloduwakutowif.pdf
    • https://dobre-akce.cz/media/files/file/11324723735.pdf
    • http://cablexconsulting.com/Upload/file/somevuzipos.pdf
    • https://monyetjoget.com/contents/files/300660440.pdf
    • http://tunesistudio.eu/userfiles/files/vagamanexo.pdf
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdf
    • http://hvezda-pardubice.cz/files/file/nevopewen.pdf
    • https://ismart99.net/upload/files/75744457587.pdf
    • https://learn-atdi.com/uploads/files/84234735097.pdf
    • http://margheritango.it/userfiles/file/bewajopobewirofuzaleke.pdf
    • http://speckrepeg.by/UserFiles/files/87940355307.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/45261497901.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tab+a7+one+ui+3.1
    • 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_off0000e918.bin
b4c51816083782bd5b5ac5cb34c7d783cab7bdf343473137f0c7f8216a5c024b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 19528 bytes
font_01_sfnt_off00011c28.bin
daf70b42fbe5a057ad2c8a6f93e1d4390aa4b13d9beee2dade8aa547cfa0dc04
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C28 10232 bytes
font_02_sfnt_off0001335f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 16792 bytes