Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4e559b8ff5700a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 19:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c7f4799a0b48eb80cdb45c5aed05c51 SHA-1: d235168951581caa6368b2c424565aca9ecc2568 SHA-256: 4f4e559b8ff5700afb55402673a2ac22a5b2ec989a9fc8de3854258166dde42e
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external PDFs hosted on compromised websites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' lure further supports the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4b26cd8be9415b18e1ad5148de0f89a7/luxuvib.pdf In PDF document text
    • https://network-italia.com/file/lixex.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/26267159122.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/difijawesolo.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/34470982946.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/57658916872.pdfIn PDF document text
    • http://livestocktool.com/d/files/73290462566.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaa8847871---zulazopefibajugomitenebe.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/73298633253.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/gekubemurifinoxovipal.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/xuwitagaluloradatamava.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/13733055287.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/15634636210.pdfIn PDF document text
    • http://wwstationery.com/files/file/71145904359.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/fp86stpkjff50g19pbr40st0k9/65445524034.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630586849.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/35488479970.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/dobilo.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/80478414552.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/8664667158.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/84651359433.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19009530865.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/68760110666.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/natanixi.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/jamadasevadefosu.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/taneraduxuj.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/4985630501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=download+naruto+senki+final+mod+apkPDF 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_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 17824 bytes
SHA-256: 1b2c5ff11094a2bcddaf1c4eba61531b7d2260055671ca0fde65a16c6efc86cf
font_02_sfnt_off00011594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11594 10936 bytes
SHA-256: 1381930bea5d43c66e8ec1335780eeb7d535be3306b39cf3818fd5b29b8a803f