Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f1b70714641af9…

MALICIOUS

PDF

87.1 KB Created: 2021-07-21 02:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 270b18a3d31d29727d4d891816a9e81f SHA-1: f3d7cbe09bd6505fb5e6b49120774d11c13adfdf SHA-256: 40f1b70714641af932630884bcd50e67a8236dd76742ffd020935a9edb74c632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the links and the detection suggests it's likely part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/65a57c50179fcdaf9312af38441693f9/sagugosisesikini.pdf In PDF document text
    • http://doingthing.com/downloads/blog/geust/files/83443154226.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee364aecac---72055155697.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/keseziwutijukumokupamewen.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/68783305650.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6b10d15a---xaberuvipigisaze.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3acbe87500---sudepukaletipoxi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d69e2eca---14123052403.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qb3oi8bkp2pt4f61t9qb2j6qta/5278936680.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/marezamapexonif.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vifilunenujafap.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b881b00013---71024712609.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vujinosesudoduzimedal.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/75689794184.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/57861400402.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bufadatufokisodi.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/42869450067.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/89425141578.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b013d6f0647---pojilutilazumafigefig.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/95120476118.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/27553024085.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073802555b5f---suvosimewixulub.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2d57e62274b4dc7715dc15b95e3de278/98638133049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=definition+of+acrophobiaPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d7c075ed12dd93ab3a34fd7f313051af/luvajodikebeluki.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC278 2588 bytes
SHA-256: db27e861a05140f88bba116ab400805e203d4d48b4bff800d0eacc6f23713118
font_01_sfnt_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 10504 bytes
SHA-256: b070cca379ff37d06e00273826b63c7ecdd5bdbecb214f6e55d8456073d15409
font_03_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 17364 bytes
SHA-256: 12d43cbac65155d3eb7392a4f02f92ca242a07b69f1a0819bcf64c26d5d6672d
font_04_sfnt_off0001171b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171B 21664 bytes
SHA-256: 7030e7be30520f174a685adfe7b465b75aa7477c4f6b3032e6581e8f4732d959

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