Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0371ef8395809…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 04:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10d1d2bd449a47d1078ff3a69774c20d SHA-1: 7ecf50e4b615dac657079491b05e9c33e9f3abd0 SHA-256: efa0371ef8395809965ad878bfdb55592f807538fae22016b0259da0724f3f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to redirect users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=ios+lock+screen+apk PDF link annotation
    • https://sin-wa.tw/app/webroot/userfiles/files/71436644896.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/levarebiwozokavarojuj.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/e44d8d024ceafc32a2fe13016a764043/11418922298.pdfIn PDF document text
    • http://goldia.cz/data/file/110213050.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/pavikuvusudilinubenox.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/disalil.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/96868601172.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b8e960172c77ec262aaade2bb84c1333/64970893915.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/32795160583.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/nenudalesofadurosa.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/rekajefosojifobixiwef.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/vefituxilibukipepe.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/90679665687.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8825af27d---siragosanejorixugib.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631735229.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/mavukadesosebupuxe.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/pefamitobogatafim.pdfIn PDF document text
    • https://jjpremiers.com/files/todilajefogi.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/goxilitonal.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/murifuzobewugifixejivesap.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/32014164748.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/63436881040.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/lupopadixiwuvumefotowunub.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_off0000ae45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE45 15628 bytes
SHA-256: b2c00dcfda9bf6a8291fbf8a1df0471013b21997134c627917fa4db156406e3c
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 10220 bytes
SHA-256: 49384585ab8fd702678f87205fd2c357bb046244dbccee010848513752beeea1