Malicious PDF — malware analysis report

Static analysis result for SHA-256 542e124b7121adae…

MALICIOUS

PDF

83.0 KB Created: 2021-08-10 06:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1511228803c5af8e62c78805841942b SHA-1: b83692cbbed3aedcb2ff2eb1634b59b1ae9f09ef SHA-256: 542e124b7121adaeebc003e49e365c5b9d6096878877e868fb9276b968117466
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfab958424---nefapabuwarurobavele.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/jofowijabumimuwi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160779dda6160f---89595566382.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a31cdf674bc---fipitojafibegij.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/96904795227.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/116c8b63869af79045f10cfcf89c5679/pujalureza.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/bonunu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34b0f88dcc---22980176056.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/chobfsi18mrp0f7ejha7qgro24/42737387720.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160864521b8edb---kutasarigoxesirojowe.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb341623e---rebimawafisuta.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/bl36tutogc43c6oak0rrdj322k/nasojugifevigonerewi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ba512c53---57272570656.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/95717196987.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nulazu.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/39309992732.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/8528648888.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/70459617061.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f54a5b7c---39714257442.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/39245313102.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/0f2008ee03d2411d903a74a1ec2f054d/lutezagatudef.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/14590345978.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/450498cfc67ce9929e32592d76aadb42/98772622349.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/48759495049.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/suripolivel.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6dfa14c9d17e5f7c3ee3070a6e063d5d/xabefoduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+official+note+sheet+for+approval+in+hindiPDF 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_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 10860 bytes
SHA-256: 8e36a673b071bb0360d7187b83c5ec6123fc8bce4e963a05c47ee84ae135295c
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 17452 bytes
SHA-256: f2eba0909ebab4cca43093cca5b5b8ac55cf0aad8c7ab6816d87d7c1326a0fd9
font_02_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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