Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f1eada6c8845fc…

MALICIOUS

PDF

83.6 KB Created: 2021-06-29 10:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f3f6f6b9a92bbed103732c9005d7a071 SHA-1: d08dcf944e462d7776104ac8018c0b5e9cae9df0 SHA-256: 15f1eada6c8845fc1982d0df5fcd9d78fbeb418b73989c086dedb4a6c3fef0c1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it acts as a lure to redirect users to potentially malicious sites. The presence of embedded URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nexxosrealty.com/userfiles/files/57345998897.pdf In PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ea585f34f28098a49067dddddd2f3356/87529511287.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/jejubegilijudin.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dhp6abtiluu6mp4r417l6klnp7/nefugokuxerap.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20a2274e95466759df1232d75bca189/9820190366.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6b7f952ca81602c45d69bba7f35e6f74/99904859020.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d27da61df---jodofa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f66a5aa38---napewaloforuse.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/68051491802.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/zilomufuvuvusikupalowume.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/madunukamekewixojomig.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec6838805---6599266275.pdfPDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d26a47237e---61777883724.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/63745929585.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kibuzulotididugelisudufu.pdfIn PDF document text
    • http://funperm.ru/content/file/javojexilajigubatavigi.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62c994c565---wimowubamubasakepir.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/2494e5a52197ec67e8e76cb303a8e78d/38283760416.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/418c746509baf8f8566670fc848ba793/31232222346.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/acf88e5f74868029973c0f49442a2c17/sotun.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/57209417053.pdfIn PDF document text
    • https://fallsplat.se/file/14242631766.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc32bec8aa4---63144995950.pdfIn PDF document text
    • https://landi-bg.com/images/file/5218763661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=late+show+stephenPDF 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_off0000e433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10156 bytes
SHA-256: e36550c7ed102e8bbd5f57e3dde32926fbf67198f3de060f18fb2736285a8503
font_02_sfnt_off0001130d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130D 17084 bytes
SHA-256: 07192255477a0a6664f2101b0b8d3c1d62450cb8ddcf409a04569891980cf436