Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c390ed067daa8b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-21 05:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce01c4b2246decb9d6db9138568e1d5f SHA-1: 6d84bbf138ba05aa1d67fe3ce7e27748672a1c6d SHA-256: 74c390ed067daa8b454f54aa6587ae88df91850a5df7155a34aa584fca71cd77
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of these links indicates an attempt to direct users to potentially malicious external resources, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac22e96050---pulumimiwejikinigitixak.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fdbb36286---dejudomalarinoxogef.pdf
    • https://chiuman-hk.com/images/file/6074093227.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/kalapezeterudaxugilupu.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3dc1542983155c30dc9e8ec07f659c49/xefowizipok.pdf
    • http://tikatalog.sk/_files/file/vomojed.pdf
    • http://joy05.com/_UploadFile/Images/file/63644256800.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b83a0460431a30806f578b839e495a63/fewoduriraline.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/91015f8eeaf1a64609f7583747b93131/sowavofupusetotitabapedev.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ac32c1d0---17706235140.pdf
    • https://m-isc.com/userfiles/file/rexubenobesufusebi.pdf
    • https://dialogueinpraxis.net/files/docs/tusipa.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/812f5ab483cae8cc3375414887d0837a/72892888415.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae660d48d26---wanibowojusedasutodir.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607905bf00e33---zitoxukitibukubeluga.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/lo49v8tdt8l8f6vmah7ggobut2/tuwufewoboviw.pdf
    • http://wamer.org/userfiles/file/riwefezuled.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/34229942470.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5330444915.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/bec03505c0db87d499511e98462b7079/kijikezididi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eae497816ebd4f25a87fc0ca45fe37e7/88527941462.pdf
    • http://comp-art.ru/userfiles/file/xokenejibevaxakoda.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0a15767e324c24af0a6c56291f7832f5/juraxute.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t4ic2cs5bj6nusm11fh9p1o1b0/ponunasudo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=graduation+letter+to+myself
    • 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_off0000e842.bin
8393c5aa17d426d73f348671de79f414bbb2b12203233c8d077f703293aaf31d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE842 16968 bytes
font_01_sfnt_off0001147a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147A 16792 bytes
font_02_sfnt_off00012c91.bin
6c8c57d6064a198441d5b12be7dc30937bebb2651406b148b60bbaa921d57c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C91 10768 bytes

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