Malicious PDF — malware analysis report

Static analysis result for SHA-256 a779838e46cbd824…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 16:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7954b726a712d89ef3c0cb77eb8cf5cd SHA-1: a1fc721c14ab74bc432c5cb23cb9c59e766f124d SHA-256: a779838e46cbd82417947757ba2b011e65792fbfb1e9edbdedafa14189e45664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=bloons+td+6+original+apk PDF link annotation
    • https://agros.net/uploads/file/33085415237.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/93462014485.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/acb47634ddb5caafc90da7c27c9889ec/21638450935.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/96484941450.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/49817511347.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc060ca47a---famimozupidapawakujalowi.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/mavuno.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/wasetuzufujedipataza.pdfIn PDF document text
    • https://gencatakan.com/upload/file/nejoda.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lisiluwutozeli.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/161416349b821d---zilagojapasodokuro.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/nosekovebe.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/63303971115.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/66h34so2s67ht3tu0ofaetervu/74099103756.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/82597576838.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/meleruwerorojoxipuxut.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/begega.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/kemoritumuxekexovakit.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/riparimukemonu.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/bubitexewixalode.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302770bb9c0---89591441257.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7967130b544e4148f4c27976402de7da/57482485649.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/12740219469.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109110313556769.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC067 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 19708 bytes
SHA-256: 577b6b341c7ba49c6ad38b6f23a8e5e3a332417f7a9fc5c2b88cb713454b58a9
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000121c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10748 bytes
SHA-256: 5fc3802418321c46acb79c830934e304e2e1fd42e6e8578c740afa0db44d5833

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