Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e6fc31d4b7d556…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 13:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f335d6c862260b24239300af24f076e8 SHA-1: 8ad30b2781bcb81c6acb67889caf6ccc89c78127 SHA-256: 89e6fc31d4b7d55645b06a48eac79e86751a53c5d2fe1378745cb0d747b6b4e9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term=download' in one of the URLs suggests a lure to download content, likely a secondary payload. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign aiming to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://crewmak.ru/uplcv?utm_term=download+happy+mod+hack+apk PDF link annotation
    • http://theffirm.com/userfiles/file/mugewadukalulejijiwogofub.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/duridepijumenote.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210914043256735188fbu33.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630981166.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/11008414958.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/3tgfecmcpm1u3djjv5c0balgm4/jexadazowijunaxeb.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/fixasakupopexatosikif.pdfIn PDF document text
    • http://apothepharma.com/upload/files/pikidefutag.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/vosamerotipasal.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52443052205.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/lijapam.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/pezolutugokubuvuj.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ea55884fc---zajiwavifofomakivema.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/xakokekaxuxuzutelugutogug.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qdltajl8g8u3jsor9q6aej4vb5/46366720364.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6137b4a93fbbe.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/33119404652.pdfIn PDF document text
    • http://vanhacollection.com/images/files/25752165815.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/guwowativufabipajarejorad.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/vefukikajexozozi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2a59577a21741ebde1e402a5e18fdce6/jinanokiba.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/92267876175.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/50347191849.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/91788518804.pdfIn PDF document text
    • http://4darchitecture.org/img/all/67000608686.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_off0000d69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69A 17456 bytes
SHA-256: d68c0632d6d9600ae8c044fd198da20bbc46e2124000c889b0c16e75101808c1
font_01_sfnt_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 10480 bytes
SHA-256: c1b2b7ff7473c8ecf9017a3dddccc45919ee71544636d35b74abd842909af17c

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