Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a54d1e9b1a56548…

MALICIOUS

PDF

81.4 KB Created: 2021-06-30 00:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d41124295c7060f51460f5a74e2d39b SHA-1: 81e054c6b20a4b564674970cb0174e32ebe58243 SHA-256: 6a54d1e9b1a565486b513598fefc1db8b440fbc7152abf01c5f1acce9fa508ce
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, specifically targeting the 'formcraft' plugin's file upload functionality. These links likely serve as a distribution mechanism for further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The presence of multiple distinct hosts and the nature of the URLs suggest a coordinated effort to host and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160941e0b569f5---febajixojozomolerafixufo.pdf In PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/t93bklfi8ri61tqkgaotpn12os/xukow.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92409d6c0b---12648124597.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160842abf2f7d4---35945846916.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc037576ef---nakatafivimolutedobususo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d93ccc736b6---mawato.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0e2e4b2e3ababccbc4f6306384f2b20d/9743622493.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bd6f70feabe2e5efaee5897c5f0d63b1/49959385308.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9ba57519---ribevilitalegavinuv.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/qia0vrk1u14196n5p13djtvs4e/28302431357.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f8980eca---75616080735.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/99847163544.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7jhmi987p7pm7ouugprgoa3k6h/jumipuxegoluje.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-13/20210613005307614042.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/16108260518.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c4752b89---tevesofen.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2b9cd7fc---10535453796.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/84374603114.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/02ab7fdadd912b314f468bdf25963316/senamogar.pdfIn PDF document text
    • https://0900107678.com/upload/file/baxofizifi.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/jeq62orr87p61q3imkq7d5uc31/bulususuvisobebupoxo.pdfIn PDF document text
    • http://maihome.hu/admin1/file/xixagatomafajij.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d24408175---roxetemen.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/bakan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=when+i+look+at+you+piano+notes+lettersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 10648 bytes
SHA-256: d7fc6a8e17c43fbb06003b7af0df35b273e692355b254a0fc34e2cd35ef85179
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 17792 bytes
SHA-256: a52cc398ef43f98833b986bf740a795855321a086ef73376219861677309af27
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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