Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58ede84a3bd8c2f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 03:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4de4a72c0a09a2534e4dc4ce016f394 SHA-1: 13d8e5dc509f6dfc3c98b300986f6b5174cf5e38 SHA-256: b58ede84a3bd8c2f046095fedeaca37fbeaea57ecdce861307a9d0dfab41cec5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://smg.bid/ckfinder_userfiles/files/64746931382.pdf In PDF document text
    • https://siroyensao.com/upload/files/jukeguxujumenirojovo.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/kumalopono.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/74452c9a3b0aea422137bc6c6f6aa1fc/xadakeb.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-20/20210620054252228008.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c46a2578---luteravede.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/figumikega.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedakobizotoraxiwowutibif.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7b9a31cc---14276435250.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/jogoredaxin.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/guzebubukizawiwadagof.pdfIn PDF document text
    • http://jsdarvin.com/files/korix.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831eaa4abdd---baxobanojotavipusujelanis.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/90952190066.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d7c17421e239d00b52b0a26f572777ce/zokejasiziv.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/josaximojulixaxi.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/24139311767.pdfIn PDF document text
    • https://ancoraeducacion.com/images/zaxuxomoze.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a17a5c94187---bulali.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/57062e9e2a10e24dc9eb4ccc2ebcbbac/28554560686.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/bulajorozofanifoguw.pdfIn PDF document text
    • http://www.heksan.com.pl/file/73163512422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=illustrator+tutorials+for+beginners+pdf+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000113c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x113C1 19208 bytes
SHA-256: b70251d6641496381b6e277ca0a6d1836530a53d14ba55cac1b54e142369d441
font_00_sfnt_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 17316 bytes
SHA-256: 64ee64f7cccc020c99976728b42e3b75d6451e6fcb48b3fb4a7a209fcd5ae290
font_03_sfnt_off000132f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F0 10948 bytes
SHA-256: a10574631a355fee339f47ec98694a9191d4cec0d3b6507794ffe43ea6f78603

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