Malicious PDF — malware analysis report

Static analysis result for SHA-256 1358a4b2acd7bac6…

MALICIOUS

PDF

70.9 KB Created: 2021-08-27 23:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2f6cdea23454a837b1b68e0ecd1b0b6f SHA-1: fd7b0e6975c74c7816c7f852b6e9a05227e8b8ce SHA-256: 1358a4b2acd7bac60549adaec108e4de05c99654fbd4e4e01fe978c31d7d074d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://innotack.com/userfiles/files/baxowovize.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6s3hkm1mliu6kaq7ie4guq65u4/62577139600.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/9639ae33f07964c1d62581b6e2c7f150/pesogekoruk.pdfIn PDF document text
    • https://anfauglir.com/images/file/98208780796.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/35bb14556f14fa04e993a51a54d9b525/kexixanavapel.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8618b673a---32084277328.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/tujetezilel.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/79585171645.pdfIn PDF document text
    • https://projetovm.com/uploads/files/nitiwubowifan.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/gogojajajixivelipaliba.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f19f83545c5affdde19bac9bbe139e36/60338018654.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cbe483ac---31527943077.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb84d1c9a8---verexavokesojanuvipun.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/32245068503.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210605_BCE0DCCD1F391271.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/nilogodemevukisinuwolite.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/sufow.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/lavovuk.pdfIn PDF document text
    • http://biomisszio.hu/tmp/78837408624.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/61354112039.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/sedav.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/fomaxaminimotorom.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/zapabaje.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/nopugune.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612398069aa01---fogigetet.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vunidovubagubiruge.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/kerovamuleroped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+quotient+of+a+number+andPDF link annotation
    • 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 10752 bytes
SHA-256: 71b0ae5ad5499dd1080771e7a1564a94a5fca2c12670a164c0e7be2fa4cbc807
font_01_sfnt_off0000d0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 14532 bytes
SHA-256: e426be3ba9de0b37730c65eb4b457b665a77757f2c84dccee84bd0bd2a3028d0

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