Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f3581ae25f1097…

MALICIOUS

PDF

123.9 KB Created: 2021-06-21 15:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 321b21ced8f9496fb1efdd6be77ab075 SHA-1: ba7d69137f6deb384fa7e24ecab1f7b1bd7a82bc SHA-256: d4f3581ae25f1097256d7012cc1bd0a16c9a23e98e50a33c9cef8478dd0836ee
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'recipes plan'. No scripts were extracted, but the extensive use of link farms points to an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=80+day+obsession+recipes+plan+a PDF link annotation
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/fdvqbhhpcqfkiiaas1u3si6qkq/loxojegavebafedum.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/upik77ofmkdib4sp7d0fsi9sdq/zevasinixuniguzilijadav.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file/%5C/zomafe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/59d6944564cafd88b153ccea67f1b6e0/sebuvipiwekatodavipiwote.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/63896878697.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/4740f17195a966917c414d04ea8e9c43/pajinakimiraxudagojufabef.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/cc0c6b129897c772f80ef31c2574b0b5/18810297611.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/p5s4nu7f910ehdi5ubotu7u2q7/62140948026.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/31a3e3dd9b080d9336e99ed089f18ca9/80302212721.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fbe5762ab73b429e251eea700dc83135/68227494190.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106091147114155.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ddea4221b1f9fe5e29fe64260f1f0d4b/pajevuwu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/2vp7r004tnh9ti0en9s5hvpvd2/15273852904.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/vvchjvtf0ta5san56u8l7b67jn/fulodimudevimepolaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C6A 5256 bytes
SHA-256: 2607ba5df7e8d68ccb08a2c576d2a377b71cbe913cd1364d74ef02f94c23e290
font_01_sfnt_off0001ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE33 11692 bytes
SHA-256: 25c50fc2eb3c8b990b7c48ed675a18bd78471ef8e106865212227eefe3f32c26
font_02_sfnt_off0001d461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D461 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378