Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95aa56cb542d702…

MALICIOUS

PDF

76.1 KB Created: 2021-06-09 06:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e22b9b9ee899763b0cab374c47b69741 SHA-1: e28edb8c0a5feaa639beea7f13da154d407ffaa4 SHA-256: f95aa56cb542d7028fb4e7e63513d86fe2611145260d2a78a279db3ad583f767
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize form plugins for file uploads. The document body, though heavily obfuscated, suggests a lure for 'Gta 4 ios download free'. The presence of multiple distinct hosts and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=gta+4+ios+download+free PDF link annotation
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096347f2bd5a---pemukubebaxatanarem.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/30/file/20210530_005917_169.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a8797f29c3f0c78f0cd8ffdc0f5aa057/mevot.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb594cfdc5---kopixunubulegaja.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0692c2d565db7f7dd4c5e0f5e979d0ce/56070771461.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/1t8bsuh7l23m599tqsqkq06pt4/juvamilobuj.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7c7b314fce0032e707ff786084462b42/31912674126.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d462ddfe63---86255073766.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a25c65a635a---52453952826.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca0640e49---minarebawegiwuxumeluzasi.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/0265c7150ee4f095c4c1f4bb14d13016/sivusofudugivimiw.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0eb277f836ebae29d26a884fdfaf7510/vazedorog.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/bobun.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2ehjh8cdq813va6s2r36lm2qvd/gixuzoretave.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/k3ulj8bj2jn2ciep4up1nfqcfc/35890197606.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/25f39f87e8a86bb099e9ab6296a2c8fe/tiroxibirevevez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/65961c18f7a5366081c5f1a39774b70d/69851836587.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5112 bytes
SHA-256: 37c51c3eed1ebbf1101258b77e2f099b0f02a826d5440db242fda574955a2b44
font_01_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 10572 bytes
SHA-256: c846e60d9314d86b04e534fe811f7e7a9d11e8d446a7c20d70c1d090c0bf26dc