Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a4b09f9cc8b2dc…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 10:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7405cbab4109176463dec5bc817210 SHA-1: 7ef58173c31581543ca6ab6eeed5aea90e53876b SHA-256: e0a4b09f9cc8b2dc0d42baee536e46d1e84572806989092503baeb737a5d8dfc
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ahlhy.com/uploads/file/281345456249.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d516eac7f5032460c30f4ff1ad7df09b/vumasij.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b180fba23a8---wavebikobesos.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098581b4892c---94112276494.pdf
    • https://ptogel2.com/contents//files/50427321668.pdf
    • http://allycatering.com/userfiles/70171553557.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3297134a2f761c5a29a4533d132b7247/20411270158.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098dd7fe14e9---nafugukezerugi.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/k9e5i79ja69jbi68bsa4n8j1s5/xagewubixudavebagowajem.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f910d94bd5---64489896762.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef67ddbae---xetuxuxaxizowafevatasatu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ce415af76f9a59e09bfcf6a09fba96b0/39076493000.pdf
    • https://giolog.biz/images/bulk_images/files/74087314265.pdf
    • http://veraschwemmle.de/fckdata/file/67163392453.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d81684ddb56---11163519609.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd41b139a2---vikotul.pdf
    • http://aplus.to/userfiles/file/vumile.pdf
    • https://blogsma.com/files/79267129504.pdf
    • http://ingpiazza.eu/userfiles/files/57249223675.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8eufdislldd8g4jibgelr43qh6/bapedixuvuxadi.pdf
    • http://healthywithhart.com/res/file/demazafomul.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757ab10ffe0---18547955891.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d283ce17622---91322822746.pdf
    • http://ya-ke.cn/admin/upload/92847817402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=it%27s+been+a+while+lyrics
    • 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_off0000e371.bin
396432d2e1647f07cacc4ab266065c9a8115b1defe7d92cd8cc95a571f5d5ab5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10532 bytes
font_01_sfnt_off0000fb84.bin
580ca3a3df53be8fe8796c54cb5e4f4ab933aeb9ebf532c9aec02f50b6bd83f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 17864 bytes
font_02_sfnt_off00012a3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes