Malicious PDF — malware analysis report

Static analysis result for SHA-256 710162bf8a9948dc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 12:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 24b27c54a8609a6fbf4db9c080388d72 SHA-1: 7474a5b9b399a2a243e4074f01c8a64ad2ec187a SHA-256: 710162bf8a9948dc625e47f8c5d4a7497d9050c550d68bc5a23a9cf011599374
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress uploads, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of numerous external URIs and a link farm structure strongly indicates a malicious intent to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fadcf61b26---21510420059.pdf In PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/159c25c7b2e2fa6db22aa2c1a09548fb/57039222542.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f0664d395---wezizakubinonefazosab.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/2248c629d5a07af57f5e423124c88fba/pikumixenogizame.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/61406336157.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/82636438110.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/dadigojuxawobeliwezip.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/vapeta.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/67296069881.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3nr5bodgoejh82cse575mvmk60/23924253469.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/rovjb67su85s823uth30fl3792/renotivebogirugilise.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/pufanabetipanubumomobu.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/botogixa.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/temil.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/1059002391.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/96574496270.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/15156282819.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/nugikelobewufirusa.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/juvip.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47f72de31---92394991068.pdfIn PDF document text
    • http://lovesenergy.com/file/zuwone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=matriz+transposta+exercicios+resolvidos+pdfPDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 10832 bytes
SHA-256: 4c49bed2d200831d589e125c53b4cb45a92414bf974d9d69543defabee0d5927
font_02_sfnt_off00010894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 19600 bytes
SHA-256: a2024f474e12c58faae17c32d794c0574f416a0094e705e85671e9b3476a1f8b

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