Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f101742f557e7e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-03 01:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 310cfb464f20fb9354c72f5504dd720a SHA-1: 6669c2c6e0d337b6fabe5eec12ecde38e03c9b6e SHA-256: c9f101742f557e7e12e8e2e62062d1040934e654a09233ce0e94330b944e5318
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=ssc+notes+pdf PDF link annotation
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/f9c0ad1f14a122a8fc6740b497f01aef/xisafugib.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/bofetisa.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ccd5bda7d4db3dd1011591a9c5e511de/83639276579.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/rutuzuluwokafipena.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/vipizezegi.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac90fd9859---43017182327.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xomivuziwivu.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/jogumobuloxew.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504050601842530864.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/74060800278.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d78a970eeae---58873098566.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b41cb0a65---15960133918.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f307c7415be943aace812f6d267d1535/27342621450.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aec8a3b3fe3---96304604278.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/76129573015.pdfIn PDF document text
    • http://araonline.hu/uploads/file/33175496080.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/64623528325.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/jimatavoribopiweja.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/e1e50697d406ef312eac4a17bc994d6f/xazunuwijo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/vonibeminobejedofej.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130afe9daef4---konobupanepamimukesik.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/jvl4ed5b1gvouce5nskkvecpg9/wobigizefafigosukorenozot.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/60150916135.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/7536547895.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/9drq944fcm1n1dgt5as905ep9f/zimeted.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 18180 bytes
SHA-256: 8e67868387dba578eef7d41d52a590e72ddf726b8eacbb9ad820412ac7dccb83
font_02_sfnt_off0001024b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10288 bytes
SHA-256: 5c0e550fa448b2261f0ff440f0e5344a95af65a0f3e91f78ae256b9e329f4eda

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