Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e2c5927d73da7d…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 14:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7457015c38a5156095449baa572104f6 SHA-1: 72371caaa2199c7094cd2e6a39418325e6891ff0 SHA-256: 58e2c5927d73da7de56e335c3e2cf17432eec259392c4da210d2b5ef30bc70af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, hosting files on compromised WordPress sites. The embedded URLs point to various domains, many of which are unknown, suggesting a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613607f2a19c1---43837826429.pdf In PDF document text
    • http://szpk.hu/_user/file/46962204041.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/fudimepoluxatewateze.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/13843883675.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/99057217840.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/26970380056.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/25870732776.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613418ef9c4d4---xiwisudikufumegil.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8dc456b44889feb3f1eb9b7b998c39ad/wubupubuwenox.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/94280060558.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/tamuzelolozu.pdfIn PDF document text
    • http://afro-safari.com/upload/files/3912090038.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61566867639.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bidofak.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/galopojexivaweki.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/povonekemigopasokeme.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161306043527e9---xamunew.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/71781948965.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/xugomojumawojeluzo.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/76931413336.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/jaxefakeselezavafemabut.pdfIn PDF document text
    • http://congluc.com/upload/files/penile.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68886165215.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/73281976205.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/55656662237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=best+offline+golf+games+for+androidPDF 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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 16768 bytes
SHA-256: aced70ea80fd072a3c939d7d47442c7b814bac6ddeac47533e44426d80a03ddb
font_01_sfnt_off00010d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12591 10752 bytes
SHA-256: 11802e37c2f5ddba38a23d5ab6f6871e1c118381634d226dfa7eb0a90eb719f5

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