Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb21c20656217305…

MALICIOUS

PDF

99.9 KB Created: 2021-06-22 15:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0f308fee8c43068f19c1d33468bb78af SHA-1: 7dd8af02f3eaaee0d1e2367f909d026a266cfbd5 SHA-256: fb21c206562173054ba3fcbf8afe9a849e8539af0075fa41884b58c0e9cd59ab
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a book search.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=kamasutra+marathi+translation+book+pdf PDF link annotation
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/5631096b52a3e34361988da4d3e07c24/78039863954.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/84dc7b15a8f6a7188e8d2ced08e820d0/81650379179.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/duwupokusamixuz.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca154f5f9---xigumolotajo.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8ccfeb67c2d50e2d66202a57b32bd03a/bafapakipu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aae1caa2a7f---fonimoxoxitowiwugetu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2d7a44bc---guraramodaxofufoje.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b6966da51---41775701209.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/witamelazilakivugupoxop.pdfIn PDF document text
    • http://sns.hu/_user/file/41030118019.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608478aa6a5bb---516297678.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/ulgpvs1u3ohsm6fh4qoaljg2oa/4607159779.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6546700e39---fomesazep.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/meq35rkdtcl8cbhhu6ntka9cs0/zebomasitojexog.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d268a81bf6---meregunamezosefisozago.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bbdc83f7c---63979453194.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/75807508748.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/b3chc38obufrmsbs0r2p2kd73t/14445860450.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00013493.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13493 17056 bytes
SHA-256: 58cb8d5c1dce970f36a3e630fd27b2c4ced01a5289f9de56c45368e87de86d4c
stream_007_off00014cf6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14CF6 17256 bytes
SHA-256: c90894ac2a4671ffaee6d4ba89bcc99dfd9447a3fdee3f16937e8d09bdc2a10e
font_00_sfnt_off0000f0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E2 5452 bytes
SHA-256: bf730c6f7f7470e5b3cdf40e8c0b1930dc6dad058032b7d92998e06439b45571
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00010e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E98 11236 bytes
SHA-256: c36a03b8427252bb51251fd9cd7f48ff1341ae50c259c585498810e81aa5d480

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