Malicious PDF — malware analysis report

Static analysis result for SHA-256 2248c3c77a07e536…

MALICIOUS

PDF

138.0 KB Created: 2021-07-20 01:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 63867a5ba2b3d59b5146935b91515720 SHA-1: 903bc0847adb6d088e01fd865234f24836b9d2a0 SHA-256: 2248c3c77a07e536589a989869f6c22863a05ff221ef6f09726f76e9475731bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ba730de25be8ab70f5f545d00591c1b4/migogarozel.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/94c2efc60a441f0cbf7da3f736da562b/16396594101.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a862b6fe0e---20358381044.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pisedinoneru.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/27417518775.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dosidipuninewi.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/lenazisagama.pdfIn PDF document text
    • https://reniuved.it/file/nazuweguf.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xesovulifu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9dda2078541ac5d7017b61b9310c87c5/tadolufekajusafisimejinew.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/7275679088.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/mifutamojikepakodok.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/5h5djltmp2gsg7ata0jg0mjnr4/sitasisumevewomubada.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/44108642876.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a12349e134118124002487449b411fa3/tipubojodup.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/50314877125.pdfIn PDF document text
    • http://viewcs.com/partner/upload/dextfile/lepulilatizekixos.pdfIn PDF document text
    • http://jaatkinson.com/userimages/kifesel.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/sobipapetenogixudibesol.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/95718497402.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/82468423321.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/fisoxejijuwusinibabu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d93c1a4d---pegudijunajege.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210527091658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=thompson+submachine+for+salePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A400 10852 bytes
SHA-256: e3862f34b4d5db6b2eaf15157d25696a10f2ec794cb82b2956cd467849edee40
font_01_sfnt_off0001bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4AC 22556 bytes
SHA-256: 4a9949aedcc07c0ee06dc78589e31bdae8fce672bc2b65845d1d43954fdbee3c
font_03_sfnt_off00020d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20D57 3420 bytes
SHA-256: dd31019c3e66ccdaff2bb8bfae996cc756b314d2cf5913dc379a075b76a17b4c

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