Malicious PDF — malware analysis report

Static analysis result for SHA-256 4179d8270b1c7252…

MALICIOUS

PDF

92.2 KB Created: 2021-08-12 16:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6c48c911a0996f1ab5b243a60ff9679 SHA-1: 846e5331057e1a78ab8ba56aa91accb0a1892b02 SHA-256: 4179d8270b1c7252b62da5e8b67c31bd81e01ecf2a040fc19777840202f2fbbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eabb6a736f---vinalorasod.pdf In PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/93088488763.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210601043706-79859772184.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/716c348bf2ba90d58d3cb7c486578bd1/42613234080.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/85620897442.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/22017463845.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/8011740297.pdfIn PDF document text
    • http://yuha.be/_files/file/37088260332.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/niten.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/nubipamo.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d21c17ab078---wekalopituruzagidizegibak.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56949716310.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93841870832.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/1927774578.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/feguxakafu.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/10541460933.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/tolixalekinetal.pdfIn PDF document text
    • http://amdind.com/userfiles/file/mopevivomubab.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d578ecd20a---birisawegapa.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c8dbbe72f---38617981716.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/ruxubuluj.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/30584533237.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/31792ff2162b7f89ba709358079acfa2/69428544475.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vumifidijotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oxido+de+hierro+ii+nomenclatura+sistematicaPDF 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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 17860 bytes
SHA-256: 059d889a0dbe79cf7b3e5e3339b27c01a443bea26fcc6380d003cb99425adfa0
font_01_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14813 10864 bytes
SHA-256: d45626be0ee00c4f9d8e35c43a91c5412c2b2e19a29957702f27bef8f74fca05

Open this report in the interactive analyzer, or submit your own file for analysis.