Malicious PDF — malware analysis report

Static analysis result for SHA-256 04479d776bba1041…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 00:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b3adbbfe17a37e4dc8558860f48fce9a SHA-1: dc062a1cb859519ccdf5ce582c06f9c058211ace SHA-256: 04479d776bba1041bc634e72652a0ada586fb122d26c117ae5edf790eadb2226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://hotelclinton.it/userfiles/files/78557488360.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160dba9524a7c8---61468228383.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf939518f1a---19619852936.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9381d2bef2fd018d7398aa2f1e7fd097/88482995068.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/sumafonofuzenozowimix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0ff6001c---figipoz.pdfIn PDF document text
    • http://meta-min.com/files/gigipukemafiz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d584a8d6---jixeruvujoguve.pdfIn PDF document text
    • http://erimti.com/userfiles/file/92741959615.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rdc5cg71f0eo58eb8uhdm25os/bifuwikuviwadage.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kirebesukavimarof.pdfIn PDF document text
    • https://businesslife.com/content/files/xowojofov.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf1cd3759---xulisudejoxawodanug.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210827153355.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9921aba95---4393307912.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/53790886904.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gunegiwedixa.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/12836330123.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1505c152e37a1be9459db7d7ef082d98/94250767511.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16231599648377.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b555af9bf1b---neravedupepesume.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/52402607821.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/66130235245.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/92487700179.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/rajebuziwubosopidose.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/97923597556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=time+measurement+worksheets+grade+3PDF link annotation
    • 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_off0000d066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 11060 bytes
SHA-256: 0ab15e59ccb34aeb5600e2a44d7e4448896898b0c7732b4e2725a4db835a665e
font_02_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 16896 bytes
SHA-256: cd452d4c5655bbd26e170cc29bced9a2c450eca8b707e0efd0913158d6de1216

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