Malicious PDF — malware analysis report

Static analysis result for SHA-256 c569c43655fefe60…

MALICIOUS

PDF

86.7 KB Created: 2021-06-26 01:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4365776774ff9d05be40b38d078d2230 SHA-1: bbb241c6ba525c636a610bb9a087ca70ecd73e4e SHA-256: c569c43655fefe606c4779318ce215b5d7b9106c0133d4eaef23802373335881
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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 https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1a4664786bef86ee1ab060d5a7b700f/xewonenixep.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51fcc8595---nipesejajimi.pdf
    • https://guijek.com/userfiles/file/fiboxutevifuvowujid.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c69bf26431f---welupirumapuzomuzovojise.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/gc3u4ukrnv1vi20va1qp3knpj1/72577800681.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f6a84928---17862169629.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc52d69a66b45f229a9b3c9266d96f5d/rufoke.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4317a76a4---52495308203.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087af2c839aa---bijanuruwagonugure.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096d4b59c982---48220781597.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9fa43201---tufagiwexezelibanara.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1a9e5d64---89110162875.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e63653897---kepasaporepidodofem.pdf
    • http://sewakendragroup.com/userfiles/file/tefaxifazodipefu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f56f39ab68---37769829580.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3dfc89b2f6b9a9baef6bce0e9cf7e05d/97373341543.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e224cc56507d7ea21a2426f75f61bfcd/44362138663.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/n2hkeuftbcjbnm7c4g8n9obpi2/vikame.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e5ab4e60---lijuza.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d782294669ac04d99cee97c616bea54e/85822296511.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee3497fb2---29050517476.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959a54bd33c---ruxegobagenemizewona.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16080f68c5921f---99317593472.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bloons+td+6+apk+19.2
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/29f4d7e9e465d84bac5406b7d758a626/43594171221.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_off0000ee81.bin
6f37261a32a2fab221074c77bc0a00551e0b164de029f44025649758ba4f552a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 17588 bytes
font_01_sfnt_off00011cda.bin
2a8a143bb643f995440459a735a124153217f2db7ec441d2ada6f6663ff9a76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDA 10780 bytes
font_02_sfnt_off000135e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135E7 16792 bytes

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