Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fab07846f075808…

MALICIOUS

PDF

86.6 KB Created: 2021-07-10 12:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d10a5d1b9baf017aa18d26783de5dccf SHA-1: bb504570c5e21f719d08447bd8808113fb2ccbe0 SHA-256: 9fab07846f07580845c668e860f071b5a86290ee39213aa4ff1e641d3be9296c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5af9907c2247de647633350a580d8beb/26421714840.pdf
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/68300054412.pdf
    • http://kulturazebrak.cz/userfiles/98373245577.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c93f9b31a1b2d59f402ab63b2aa8ee71/tonimo.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883b63ee1fa---xapipokezuxo.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/t6qq7abirrucdbi5sk0s2tkesr/53951091262.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423d85ea99---rufafobemewujutiw.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/df6pigbauhtif5ta7f79lm0pp3/59565861427.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eiubj3amt3qkm4qqt361nha27n/lejezakasem.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/071d4babb3dad889541dd521e34ea034/dizizupovopikawozo.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc166d5577---8704619646.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d427bfe1a---93099782403.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e5d9bdb4ffd520e0d8bdf2eb95a9bb60/21838258988.pdf
    • http://nail-free.com/ckfinder/userfiles/files/74636880609.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/20gnsd2m8lukseehqcdd5fkfj0/11817711269.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ttf6nkja78a9npeeu9l0bi9544/nefonasulikolanoso.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b778qfakpoumtsuiaa8afua1t3/15269777566.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/1609286962.pdf
    • http://autoscuolemontagna.it/userfiles/files/49244330282.pdf
    • https://vildmarksjagt.dk/userfiles/file/61480017594.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/52uhjeoeivgo669odqn7c6ta13/54374841410.pdf
    • http://ypperfect.com/ckfinder/userfiles/files/tofotufisaraxofewomevon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=was+the+dow+jones+up+or+down+yesterday
    • 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_off0000f046.bin
014ab18ba38ddb2926479e7c01dd4117f4a54625b08decd860440241aab81d32
pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16884 bytes
font_01_sfnt_off00011c34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 16792 bytes
font_02_sfnt_off0001344b.bin
1049dfd32a83ed117491074de0ce3d80ddfee31a01a09fe093b22fe30eb7d103
pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 10772 bytes