Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c04ae90b5079fc…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 08:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38a3440caa65d11c2103ac097d3a7d43 SHA-1: 976e990fe6039df3f80730a1f87a8cd1773c3c58 SHA-256: 81c04ae90b5079fcfe8608811940b31e1bc462a26d0c1d695ac74d029896ffbb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pistant.ru/uplcv?utm_term=cbse+class+9+physics+notes PDF link annotation
    • https://alnahamgroup.com/userfiles/file/nijebagobozajuza.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/46668738100.pdfIn PDF document text
    • https://reniuved.it/file/13001845482.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/89171514893.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/kupavuzasimemogibex.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148d221c2976---38262930112.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f04a72ada---34130171941.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/ravopixowewikevolimiriz.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///zaguxejikuxu.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/dusisiwuwugogopol.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/63632579240.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/zakusigagelebipimenido.pdfIn PDF document text
    • http://lachina.cn/upload/file/5063862477.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/nudoniv.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/58537357582.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/birawusapugadibelotalosas.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/dafibazelipitubonef.pdfIn PDF document text
    • http://hidramaco.com/files/files/rofol.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/gibugolufudejofe.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/pegurimakibonudigadani.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/ruvikemupefawiponofagav.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/79560568505.pdfIn PDF document text
    • https://afraitn.com/basefile/afra/files/25136063289.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/b0pp49srigp705a3do4an3mfa4/99714358107.pdfIn PDF document text
    • http://olympusflights.com/files/files/vigomuridasunobotamenete.pdfIn PDF document text
    • 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_off0000b0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 10824 bytes
SHA-256: 337c80c9e5717b163f78958ca8929078e7c114a0049c405acbe518d1f4be469a
font_02_sfnt_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 14640 bytes
SHA-256: 39b3011ddca04eda12bcca6758480ec5a8fda9695e5bb9f561bd26554682e28f

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