Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3cd3a3ea6e474f…

MALICIOUS

PDF

94.8 KB Created: 2021-09-04 12:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1592bbe7eb24705aa584f27c681c93e7 SHA-1: fcb76c634cf4cd7e5cf67b40dfb37959c83d383c SHA-256: db3cd3a3ea6e474f38b9eeabb458d42322bfb19c45fc53a9efe34affd461dfc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://irlanc.ru/uplcv?utm_term=canon+eos+mark+ii+5d+manual PDF link annotation
    • http://aliceinformaticasrl.com/user/pages/5642500077.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/08cr66lm4livlreq148f31g8g5/botatukedetakevenot.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/fujolopijonirisamog.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160899c2317f08---55809788790.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8131a6be1---gadojupoziduzotox.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/xavalesul.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901091827.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3dcda6ec2---83638975582.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/24458365545.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/nabodevoba.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/86143428089.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7935971e---19197002549.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/newavigekefi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q2ku0aannaan8cfsso7h7g0l19/57407475728.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95a28c061c3a59d06083c6b08612ec7f/85014439036.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88863996f7---wuzulozozemisunutibos.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/fasegofivejakadogek.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ac06372cfd175e57e84b718647f78617/13684591584.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/87553018763.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/33742246412.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/sowowoxifumegexazabivitik.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/3330913486.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/66388481688.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_off0001026d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 10668 bytes
SHA-256: 368eaaa2c001b771e9eb7bf37776f91e7d4ba9252db15989303c8c74b688cd4b
font_02_sfnt_off000132ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EF 21716 bytes
SHA-256: 99c7ef57d4374cea8aaa2ac0ded44c371866c267bcd12c9204e31070b9e9356f

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