Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e3f4db5ecb9534…

MALICIOUS

PDF

86.1 KB Created: 2021-08-08 06:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8db42ee74ef5206b0e30c964df7a3b80 SHA-1: f997940833f9bc2b17ffa7463a3b8c41b55d3bcb SHA-256: 59e3f4db5ecb95347f879e5bb4cb6b40c5e4532ec59c5731aa638fc83d8242c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic confirms the attack pattern of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nzmbc1611.com/clients/e/e6/e6eb4f38db7021b04b945082fca6026d/File/lewazonilit.pdf In PDF document text
    • http://alrabbancapital.com/file/files/lopojezuzelimobotaxekelif.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/10596177428.pdfIn PDF document text
    • http://kbchina.de/upload/96240407121.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/madabexetazovutomovapum.pdfIn PDF document text
    • http://heritagecarletonplace.com/clients/c/c2/c23aa4fb54f25340752d20cfcff880b2/File/84036391817.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68181900f8---xumiru.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8226eb092991c6d271a79c3661546/61197145448.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/38757191020.pdfIn PDF document text
    • http://novichiha.ru/pic/file/15148888842.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/liroripefanejovikexoxawa.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/palutarobuvaliri.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210804170808.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/c6d93e9f7bb2f828facd1ea7f8793dea/notamegisefozajupodus.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vnmfa1lcce35kdfos2uqvsmvd/wumopojudujazomele.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/23276884501.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160873966c8f90---dupokitojisexulidifanevo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pitamelisupewo.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/38562666740.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/zalivineruzizexi.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/mikibu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/45922479711.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/81012151760.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/43764209955.pdfIn PDF document text
    • http://cmtsport.com/pliki/4583813589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=avant+browser+download+for+windows+7+64+bitPDF 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_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 16332 bytes
SHA-256: 6a4677a30acadb8232ffa7040ae8f60913226144343554513140a740171d4651
font_01_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307A 10916 bytes
SHA-256: cff3bc51dfc6035f41076a3a1596e28d98cf911eab289570b36043b2d97380b2