Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0aa018ecb154cc7…

MALICIOUS

PDF

86.9 KB Created: 2021-08-25 11:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 379194fb68764648161667402dd6a907 SHA-1: dd1a6721fdac8316e34505526746f436bec3399e SHA-256: e0aa018ecb154cc71a646880b1087b3925ec83efb205c62e3dbb6b2668630443
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and contains no readable text, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cesishotel.lv/res/wysiwyg/file/25225886924.pdf In PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ff9c1d5cd---56421019294.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160af4db738e46---giwekalubumife.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ab21b37b0---muregejoxizolisusajepidej.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/jodixi.pdfIn PDF document text
    • http://fygl.net/uploads/file/031139521903.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/wisavemokidivifililadamin.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/a4nqpsnp3hjv65m4h9okog43ud/19721388312.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8712fa5652---92946918609.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e9cde4598---49472809904.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161184da91269f---petikirutowizudugaw.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85853af26---duwobawokav.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/10694524927.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/23018342463.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18f80b9118---busoja.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60406826205.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/92269649657.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a654020e1---24584001134.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/xulamob.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c6098e2dea6---77102251004.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/sotaruwakusebawijazemosa.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/16899833144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=thalidomide+was+marketed+in+the+1960s+as+a+treatment+forPDF 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 11272 bytes
SHA-256: 981d768f7eba7b2dd1ba9bfe163237f3b9294e5236bc320c0c5203d62dd5b258
font_02_sfnt_off0001221d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221D 16652 bytes
SHA-256: 0dd1570b922833ac6994d270dd521b10d6c44f0b3a155807e3c1bb74fd66ffbf

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