Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd03105108074f4…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 03:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efadda1a13c35f1eeb0aaaeb2aff54c8 SHA-1: 3fbea4318e54dfef394d938eff9e6b078d01ae72 SHA-256: ddd03105108074f44499138efc8ef5a6fe53c208978b48331d268a0c5a577bab
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=zamiana+jednostek+klasa+6+pdf PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/91775301791.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094056e04afb---wekosajodikugawi.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/lebizopaj.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b416d4970bd---kurifeb.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jixapezafex.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/merisumafoxu.pdfIn PDF document text
    • https://digireg.it/upload/xuxajizipapetoj.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7839868bd0---nidedofufovix.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/m5b0lvh9u1dkilbi71efp3g35s/fasikerokula.pdfIn PDF document text
    • http://mobilenmr.com/files/files/56104775511.pdfIn PDF document text
    • http://dr-temt.ru/images/file/ritosuwosofojadak.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/dutegalonujujosije.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210602133708.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/gigotunolofarapadene.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa3015440---fovewipuzaf.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/4c736d7847ad766e3b46483f86afe068/kenenugifuxazaj.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/79711234955.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/83683689885.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7aa29cc95---bugatemepadudus.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7c9dad3d9ffb80db30310a474aaf0802/tubutiregalazexukixa.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/69369880624.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16119ebb82c566---96016309282.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e772429952f455dec45be64db49f4565/fuwugaxesiniku.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c52509cf57---nagaz.pdfIn PDF document text
    • http://distributoram.com/files/file/9039569839.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_off0000c13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13D 17200 bytes
SHA-256: 3f2ca4824c71593da553356ac46b7ac8b804680e2268774ad8d845314da16572
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10912 bytes
SHA-256: 00a3d9e3b3f50f330b0f39e7a9651638e4d19a3943b3d59ac1b75409e723af94
font_02_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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