Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c1b92d257d2cd0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-03 23:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7563561a25b9de37064960e687cb3ab7 SHA-1: d893ff1a02ef1dac23a89cf8c9e406f8d21c069e SHA-256: e0c1b92d257d2cd031654b162b92891245de38797022b43dc9d0179ebed0acce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF structure and the presence of external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://devismesport.fr/userfiles/file/susodowaxorodedi.pdf In PDF document text
    • http://hy-concrete.ru/d/files/kesolabofomatetafije.pdfIn PDF document text
    • https://preciseenergygroup.com/media/66570761668.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1i8ohpu2giljdnv835q9jg7ks2/12280115326.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/59668373785.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/71359402643.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/xemaxopa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/372eacbd660496e6676716beaa41a345/kegif.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/89n7aclaa6mmhmv262lf10bqcc/10303909620.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffd40939d---98780402612.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/55140367039.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312ea1b0bb---talabilosukelote.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/keripawujujepolomafofix.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/59074231770.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210716101639492.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/66072203479.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/97506919593.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a0f694490aef3ae8ec2a2ba8c49eb937/kokazile.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161006bdaae312---wasoterefu.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/mafupezuxidulusokogotu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/0anj91pplnnolruurhiuqp4tb7/41962526734.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98bd4cdf1---29847049868.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-28/20210728051419838075.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dec3fab401752acc2eacc483ef1a7ed8/82541653411.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a5be0f7fe77d500ecaf569045a5017c6/64715342680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=divide+pdf+file+into+two+partsPDF 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_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17672 bytes
SHA-256: 38d529d39617f0cd37fd3959bec61d9c71bb5c8e4771fbd59e70ac039fae47b6
font_02_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 10644 bytes
SHA-256: 2ac7cd48f5a6814a38b522e018f3cc35c8bb14f358181c4c2361549303ea54d9