Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e5a386a103792…

MALICIOUS

PDF

72.8 KB Created: 2021-09-14 02:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 43ee988f2180dbe540c3c9a612b104a4 SHA-1: 461430b8714061a7e6d9a6479bcea643f8ee6b1c SHA-256: 153e5a386a1037920c88029da71f51ddc15ed350898996a6431ed28a5a42882e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=apk+maker+pro PDF link annotation
    • http://globalbando.com/DATA/upload/files/202109032228572412.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mubuxer.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cd8a7b44a---diwijuwezekejux.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613905a0253a6---ravarajuzafapilo.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/14952538205.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/vagaduwunorijizuxita.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/ninenipekipurifig.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/tawowibe.pdfIn PDF document text
    • http://yibetter.com/data/files/mefalogujesotosokeboxobe.pdfIn PDF document text
    • http://simonide.org/userfiles/file/68010072130.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83576397588.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vofadelozexexudenis.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/fatimokugomugakegivi.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/wepolitelubiki.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f70b9d9d69---4858814780.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210910030602.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25177769705.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/madadabubusikoxo.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kebuzom.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/rilabamiladusuxejo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e1302a597f08a50a52692eb91b45075f/zuxekuwepov.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/kilusunumaneroku.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/69483803453.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/ruluwasipamemofomano.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/17486284512.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210908115858_i66fni.pdfIn PDF document text
    • https://lapdonline.org/file/laxodipaxuxixonul.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_off0000bfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 15640 bytes
SHA-256: a6fe7d7c2a5048d897787e51989e17d72b5acfbc3da434a5939e6f4e3de0ad1b
font_02_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 9980 bytes
SHA-256: b0028000c135da2526a8536c8a0f553e83586b6369085139747cd8ae91f0fe80

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