Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4c4bf2c8b45259…

MALICIOUS

PDF

86.6 KB Created: 2021-08-02 18:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9dabb2c22a582eccd4f031ee88d5ee27 SHA-1: 2c33111e88e2b5225294f4b861c260c131dfccdc SHA-256: 8e4c4bf2c8b452599f2fdc94fe7378f4c3772653480d780cef6209bf0759cc59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The presence of multiple links and the use of UTM parameters suggest an effort to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=alcool+de+menthe+utilisation PDF link annotation
    • http://akvari-um.ru/userfiles/file/38995834888.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/73412100428.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8bcc4bcb4---fimevobifusuf.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/metokimizumokufop.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/28595109678.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b9aab267f---xiziwujafepurof.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a1ee52049829fef047bba2fc41fa43c1/wodonejefisoxubep.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/6840241995.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a72ec17b7---woxafivodoruveledi.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/ririxeriwike.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/700fbb3b1ae054c5138685eaec65aabc/zupanomitegonadika.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8e37c646---35929594728.pdfIn PDF document text
    • http://redactron.com/userfiles/file/24068376128.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/de49e7e956cc43ebf4a63192cbe72440/95700246934.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/gisaboxowabipifedo.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tnqma1ugg7ltr6a2ed8nh5ce62/ronifaxe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609462856fdfd---goledufijorisafutufex.pdfIn PDF document text
    • https://sharenkon.com/files/vowebobojejenexu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fcb88b510dbf30deea0503b68e5395c4/bizabelamesepedos.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091ad66a2438---segajixawaleno.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507005303901985.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/22802149333.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8278842f7---49600270365.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_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10616 bytes
SHA-256: 2cc8b4fe3a30d9932341adf474eb8818af95f6de8b0a789d719c6bb6f0ca2a3e
font_01_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 18800 bytes
SHA-256: 24ed780803d8d783fde0c945c6b3777931d56e98e2c84e4341702043ddfa7a78
font_02_sfnt_off000132ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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