Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b88112e63b3f27…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 05:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a46e2122a0a517edacf0c10083c32a7e SHA-1: cc687d1bed9f508037f43c780f4f41e5c3efb2e4 SHA-256: 72b88112e63b3f27052fe82bb711be742571ff6b3a48f3148ede1cf76300ceb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=finan%C3%A7as+p%C3%BAblicas+resumo+pdf PDF link annotation
    • https://binarbaidrealestate.com/public_html/userfiles/file/ruzolinolepobexadexow.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/28178349029.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108e6d4a522f---tusuwax.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8922260c---taxapipaledinako.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9qdf4hpvhvdg58i6btfonvb73/xawawudajejiro.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/33043600360.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609253bde3b3d---96026531584.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/lexovibugipowemaz.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/xipuwajaruwisetulobovefow.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/10590582440.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/rebosafazunidokegude.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68858060091.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6efdb2c6ee6f3d01a102ee915f5f86e6/88033251130.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fosepotajafosalopojem.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/xexipel.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/58532516306.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/zubowekonumugizopuko.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/duwakewipuranifiwevab.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c038747d9f7---miwikisevafanibemoma.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/didonax.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/fexikamix.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/23308307168.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/gufabaxuw.pdfIn PDF document text
    • http://chinalabware.es/d/files/giketosezudib.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_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 20412 bytes
SHA-256: 9df895279fe47f0d65bba5195aecf398a59b71195e2dd1a8c376d9c8a9057849
font_01_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 11216 bytes
SHA-256: cbca0cb7884248181ffd477bbd1a831d2f85898b73cf34b5445e43dd180c4056
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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