Malicious PDF — malware analysis report

Static analysis result for SHA-256 561cb75b8fd2d837…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 10:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f865db52e5abc7e30b64340d8696eb09 SHA-1: b8820ed54dd89419ae5918ffcf805f3fb6cc9fb3 SHA-256: 561cb75b8fd2d8379b30bd98c9e097a0ded1d6740c859d9b8aa8b876f505182b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 6

  • 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.
  • 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://studiovizia.com/webroot/img/content/files/mosap.pdf
    • http://canxetaianhduc.com/images/file/wibubaxufemapivim.pdf
    • http://sklepjola.pl/userfiles/file/14851951399.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/507d97442e5b8cbde70259ddc4c51676/49055440918.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/krq5fpqopicbg0ep9rlov48k6n/82100031758.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/1onfiisnj65m72ossckrggima5/18822764926.pdf
    • https://fenixfalt.com/userfiles/file/43900091782.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda46aded9f---76054276607.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c74d73e64c9---34474804375.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/fimamufoxosokepepuwib.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9829b079d740a7fb487ba44ee56a7b85/voderafaroditukaf.pdf
    • http://cpgny.com/userfiles/files/38157431214.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d291946799c---27642269063.pdf
    • http://hbleg.com/admin/userfiles/files/96305915347.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s3jfgqtrps9tfm26l5no9430vr/88506257378.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4d947dae---lubolopines.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d16a9f4e6f75e50a799367cc52a3219b/jupuxutojulojutirowebuwof.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a79cc646---fovasujunepopinaluteraj.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/751c5a01656a84133ab0ac403db97c35/raforubewededakag.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/jepudipipusajupolojile.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/pticmpnpl451j52qtpa01l1iq8/wodoxovopodudekupaxawi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sd+file+manager
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 16792 bytes
font_01_sfnt_off00010271.bin
77a032dcc50d75633130165ebd8d7f1bfe026169d9571678aefbd73be7dc37e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 17240 bytes
font_02_sfnt_off00012eb0.bin
3689bdb0943a7a37c63cad6618cdd46166ba9e3a1b02699e017d43f76fd6fc4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB0 16748 bytes
font_03_sfnt_off000145a4.bin
b406d1e4c67cf040132062d5761a3f02ef347dc766f50253e0240f191c26014a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x145A4 10384 bytes
font_04_sfnt_off00015cd0.bin
5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CD0 2064 bytes

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