Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdae50fde0590f8a…

MALICIOUS

PDF

87.5 KB Created: 2021-08-04 06:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8d4e6a1b5d42fdf3612bed5a4c8f97b SHA-1: 6f12bee87adad3dd6f591360cdb2171e4cc72565 SHA-256: bdae50fde0590f8a8f125a64634dce389ae70decf396f7773ba405070fc536ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common vector for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800251c2f2b---totexonif.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ef02b0126---vubawoxowunexurow.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/94914615903.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f43a8624e1---razoteluruni.pdfIn PDF document text
    • http://skomi.ru/img/files/file/gogetazi.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/24847425399.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160849f767dcf8---95985310770.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tajukedezugaligizupofesi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746ebc2fa75---11848946364.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/65080276515.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e1a0aab5e5c---jalaxaravokajufix.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59f3ae5533---kepisibojebilifezejasiv.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bdd3876---nasewegedadonono.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/72f7430de25f034960c8f8ee0a96c370/dukubokigixuxofuloza.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/m29cvsmjhlr0nphe68nh803vh3/pugagogavuw.pdfIn PDF document text
    • https://comfort8889.com/upload/files/dakize.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/44693489134.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/tatefonobepej.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021072423051_389921371.pdfIn PDF document text
    • https://tipresentoio.it/images/file/80698531334.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/bijogol.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lakadinu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e76a64055c7---rokop.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927674e9d8---bokob.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/bokivofotojomubazufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+get+my+acer+tablet+out+of+demo+modePDF 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_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 10976 bytes
SHA-256: 4d9923591fb6e06cfd461b4d35a711a68171753015a5e94a03752c6ebca770c5
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 17872 bytes
SHA-256: 8e41db096f76b83557ff66d7cd98ecb2fe47ead87eede47f4ec03881883a21ed
font_02_sfnt_off0001367d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1