Malicious PDF — malware analysis report

Static analysis result for SHA-256 a314b9f04072cce7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-14 00:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc5afdb0a0f35b407e4d5296f72225be SHA-1: 1a32b47879805736fe015fce7957fef949215bc6 SHA-256: a314b9f04072cce7a53d84a05e41025b4b91dceb9b2e9f92c207e99d7783628f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=mutilate+a+doll+4 PDF link annotation
    • https://immobiliareincentro.it/allegati/file/42402020468.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/46840320084.pdfIn PDF document text
    • https://siroyensao.com/upload/files/vuvagumugovulobixiw.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/wolixulerukoz.pdfIn PDF document text
    • http://precisao.org/files/files/4062966121.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/suzivigupudusuvo.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/6cf780f2db516364b9c4a5173e044b5d/duzukititesakumametexima.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/winasiwawerotaweguvi.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/borodikemexisevapo.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nuluzutezigafujopigiwikor.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed891d1a64---rilinesusim.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/botuzexusuxidoxatuwejod.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/58280210170.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/nonefulivajerufe.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/dijujid.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/99453715177.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/zijugazakomivudebumelila.pdfIn PDF document text
    • http://fitviewer.biz/files/file/bebamuzexolateponexe.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/96377522217.pdfIn PDF document text
    • http://askort.pl/Upload/file/37570960762.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kerugiruribe.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jc3vm9nscb7aqj6ol8bsdds4h9/mepiwevosikorugibezu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/wuwesujima.pdfIn PDF document text
    • http://svx.su/ffile/file/muzoli.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_off0000b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 15096 bytes
SHA-256: 09753f06af2843552a2a2448e396c6b79e005a3e4bbbac5be8040000c2aae471
font_01_sfnt_off0000da7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7C 10040 bytes
SHA-256: 07370b97023dd3d49e9e0ffe27d90752dd2b762f28322cd6b7087671c341622c
font_02_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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