Malicious PDF — malware analysis report

Static analysis result for SHA-256 abca21df68c12002…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 18:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c86790a7fa7764ddc930a00adb0ca98 SHA-1: 0242caa985dee5b72295f66e7676484e40938314 SHA-256: abca21df68c12002f25816e3bc5ca18849af55c317d1c060b0b0a2a9b0ec2eb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c3348395---728372493.pdf In PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a553e5edb24073524bb74a51b75dd78f/gozuk.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641094dadf---44540897633.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a3107721d2a9c1e4e77344232c3565b5/87315161030.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/vilarupokamosida.pdfIn PDF document text
    • http://fullx.net/files/83710843116.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/84691397797.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/74364415821.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842ed6b7ca---98029165794.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c33e6cae---nuvekukadexikodizifafipov.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c013939d9f57a0d8d92dce8bed8f5000/85383870172.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079de50dda01---vefirexavoxeduvivezelewi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/f2544a16e843a86aaaa5f3f47e73f915/zozalapiralebojigab.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8g39jnh14djb8lms00r54s9ast/37435022379.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/peliduzabomeneripetoke.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/niduxasedefumutixek.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4u626c8a0n29v493dco8gcqm29/69822301690.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/roxevokerodib.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/vorenozetarufukobow.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/buzujuwamikeriwaviwijilug.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/88032365420.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/remomorotasumonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=passe+compose+avoir+irregular+past+participles+worksheetPDF 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_off0000de44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE44 11064 bytes
SHA-256: 2ed5add7081525e884cac37d2f18ef5f3a25839987ff6513ece024fc5b76c595
font_01_sfnt_off0000f822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF822 20428 bytes
SHA-256: 59d4ca917bd538f1b607e88cd5e42084e44924516fd190d9bc49e300b6e2c19a
font_02_sfnt_off00012d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1