Malicious PDF — malware analysis report

Static analysis result for SHA-256 742d949e0b859a32…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 00:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f830a663430384290d77136bf772ce4 SHA-1: 01272aaf71000dd48b55fe67d2ffa10f24869c90 SHA-256: 742d949e0b859a32b7260cf9be61115d5d1c1cf49570ca098cc6528e4f5a2049
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9162

Heuristics 5

  • 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
  • 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://palenice.net/obrazky_clanky/file/suxevapeki.pdf In PDF document text
    • https://villamishkan.com/310renonew/front/images/files/49735722823.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c87t9nq391vnoce4hgiaqg3p3i/nezimif.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/kinesedaxojazurulumatulok.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4aef2733---65814221361.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/zileg.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/mokulozawuwamevu.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/47654159007.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/93584573774.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/77392179503.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1615663bee---17511537558.pdfIn PDF document text
    • http://hitoduma-d.com/files/files/lunagisenodofizixali.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/46957020469.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851bd93c484---45501532546.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/xirasewotabu.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/20226816271.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/kejiluboxupivaxiwesafuz.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/legizileravatula.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e25d7a36---wikawisarevigadow.pdfIn PDF document text
    • https://drlanda.hu/user/file/65659782132.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/86440564783.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/69988399113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=themselves+meaning+in+englishPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 18116 bytes
SHA-256: 6bbe9e12a0114459c64423ca72a5e5f01c74ea99cb7802903b7e7e6eb476cb6c
font_01_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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