Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b70c955ec6ab57…

MALICIOUS

PDF

84.7 KB Created: 2021-08-30 18:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 320b4866cb57a35f667a1cdee5ffe3d1 SHA-1: a716d9eccb8b6f82bfb9f50b75c41770e3f86b70 SHA-256: 41b70c955ec6ab57cde42b774134c7ebdaae96020cd453812b6970477efdd52d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1539 Steal or Forge Credentials

This PDF document exhibits malicious behavior by instructing the user to disable security software, a critical step in preparing for further compromise. It also directly requests sensitive recovery secrets or private keys, indicating a phishing or credential harvesting attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially compromised CMS upload storage and disposable hosting further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://manilag.com/FileData/ckfinder/files/20210829_D7D4F3F73273F709.pdf In PDF document text
    • http://thuocnam.xyz/images/files/8109242463.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/12332363979.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/lanobaza.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d43092a08b99e91455fb92514f3cf659/84586214357.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/givadanezoxabusomosaveri.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/dawupawelelak.pdfIn PDF document text
    • http://halaljones.com/uploads/files/24384443007.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/29216731245.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/makosonisibefazojani.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609287256e4b4---52742880540.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c575578752c---83471498004.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1934c47a9---xanegorejakax.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c269d1aecb---72407699313.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021061412593360.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/ziritafitivitizi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad0387d4f---romizeguxilizutorirosim.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/61735516528.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/40492981182.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/21798662811.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/39280678608.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/74614598105.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ae4bba0a850ecf43a54b3f5933831869/woporiginirebexeguwon.pdfIn PDF document text
    • https://aashianarealty.com/file/dijurav.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/cd55804bbb95ea6b4c6c94c3f0041a94/14031367892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+unprotect+a+pdf+filePDF 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_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 10620 bytes
SHA-256: f1dffd32ef80480e8ab4c1729b772f932db4b48ba957d17faaf7abeb158d4510
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 18064 bytes
SHA-256: b8b42e7d8e8d6724d8853d1dcd1d5994127dd9703e561ff2bfbcfc72b13e8622

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