Malicious PDF — malware analysis report

Static analysis result for SHA-256 9734dd79547e0d78…

MALICIOUS

PDF

68.1 KB Created: 2021-09-18 12:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb97e27b17caee25353e14bee04b90a8 SHA-1: 73ed9b33c5c82ab358c4b62e99bc4a0d6659fd62 SHA-256: 9734dd79547e0d78a68c4dcbe244e1d2bd8d350d3993290fd71d394a27b73de7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic for phishing or malware delivery. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of external URIs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=how+to+remove+wifi+restrictions+android PDF link annotation
    • http://noahmission.org/dataroom/file/vuruwesadozos.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/38008907717.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/62124526626.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/mulemaloku.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/lumexuwitazifinex.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/83821082113.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/bibugamaxowidazopewobemo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/ginerebenow.pdfIn PDF document text
    • https://soechi.com/userfiles/file/10647242559.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/bemagilag.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/82472574020.pdfIn PDF document text
    • http://jfe.hk/userfiles/gujoxetuwuxumil.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/48150922413.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/lolebuladumoximarawaw.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139323438a03---tenenaneso.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/552c1b124791e1b3a45edead4ea40b08/wabivexibolexivinemaj.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_3827F17DF3CCC377.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/bd0b60e50a9f11d51f73ca499fa366ca/kemob.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd68f724---27705879109.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/4418226312.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/firumanuwefopupases.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/86141412408.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210911074501.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/gegakaxumido.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_off0000ae2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2C 13856 bytes
SHA-256: 94d95b532b114a6d35c02d6285d20f6ff0fc4c85cb534570c5558071c3c144e6
font_01_sfnt_off0000d004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD004 10732 bytes
SHA-256: dfdd8e2c2556f06717950d90ac3760a7ddfa5140cdbc1d95f2906e449ad1d1e3
font_02_sfnt_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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