Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441bb5462ae6744…

MALICIOUS

PDF

92.2 KB Created: 2021-07-16 09:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a769c4860df1de1d185ced4b347d656 SHA-1: 282431e09a993c470e758d55fd973de0802416cc SHA-256: 8441bb5462ae6744dec77ce8afbb3a3722277a38cfdea870d1d21f8828cd5b4d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are structured as a link farm, suggesting an attempt to lure users to external sites for malicious purposes such as phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/5490d8f963d82e01cd36d877b32bb086/lutajuvuw.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5ef9982be2def8ed8cbc29f5753f05ea/zinifalisuwenebujexigo.pdf
    • http://dedanskecasinoer.dk/userfiles/file/sofitigojekenuvenu.pdf
    • http://www.allatpatikapecs.hu/images/file/xokepobobuniweburor.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742225be118---58935076527.pdf
    • http://klinok-saintp.ru/files/10439686182.pdf
    • http://it-hair.com/userfiles/82663660529.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9143154b---83305483704.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32ddcaa687---jofigigojevaluvofo.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061914223280554.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607429382a5ff---61126640115.pdf
    • http://www.tokyomagic.jp/images/library/File/nonigiduloguwilofimufibe.pdf
    • https://topinsolventa.ro/userfiles/file/dizajanijonezigifu.pdf
    • http://paoladebenedetti.eu/userfiles/files/74965235428.pdf
    • http://benetalent.com/upload/files/79929245806.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b55b3ff66---jawamidiwudedidetunuda.pdf
    • http://erfaspot.com/resimler/files/subugixezanebe.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16243946635999.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7f2582e7---73392858220.pdf
    • https://pergamine.com/ckfinder/userfiles/files/bunimigifokukazes.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/k8v7smr9jne2bkft67jdo8e4m7/79743829646.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e14a9509---dopakagazedomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bootstrap+icons+fa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000144fc.bin
ea43713b70001d9a5b29a09df0a43124ba339b7df905ddcd0356b4adf98babba
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x144FC 18888 bytes
font_00_sfnt_off0000e4cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 16792 bytes
font_01_sfnt_off0000fce4.bin
5b8a9326cc8dd9b16be2bb5f75f8016a142cca35b74b07bfb10dc9668a336af6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10348 bytes
font_02_sfnt_off0001146f.bin
b9f77c13e2d0502aca6cc85475f3dc2db8a89f908442142660874bc72c248b0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 2976 bytes
font_03_sfnt_off00011efb.bin
ba74d22e98d845d70af7a7cf85070b34893fad1893febd286c7b5fd1e9e79830
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 14952 bytes