Malicious PDF — malware analysis report

Static analysis result for SHA-256 777f780c255a2147…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 09:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33919c53223b53f343d60b0995b349ae SHA-1: a3bfd1e98b73c8171684f4ee1351066ece5f9d3f SHA-256: 777f780c255a214759ad749d04525716ba386944a442414cf0fb58a7cfc39a1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term=invitation+letter+for+church+fundraising' in one URL suggests a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://emusicmarket.com/upfile/board/files/bovetunolijuja.pdf
    • https://ph2020.org/FCKeditor/file/11187984187.pdf
    • http://fermobkorea.com/userfiles/file/20210803144621.pdf
    • http://buyyoutubecomments.com/ci/userfiles/files/sazawoliba.pdf
    • http://ilturismoinitalia.it/userfiles/files/30906720191.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b3acbedc9---nosaratagix.pdf
    • https://officialbacknumber.org/editor_up/gogazalofitozapivi.pdf
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/radozezozifugosasajulan.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f038338c005---vugudugididarifexe.pdf
    • http://zuche0551.com/upload/file/bufetotinagolava.pdf
    • http://stellarp.com/userfiles/files/ponewog.pdf
    • http://propellerclubsandiego.org/uploads/files/kovojikogadotisipux.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7351e7f28---90906738119.pdf
    • http://usaoxin.com/userfiles/2021-8/file/97769210610.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d93c48483---28947854184.pdf
    • https://powerliteaac.com/userfiles/file/bulum.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161297e15127be---suripuduxetedirobopa.pdf
    • https://bevasilicones.in/userfiles/file/69517464812.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc61631d95---10002841757.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h89f8ronkb7gq2iu7578hat4ve/riwirezawoxadupowe.pdf
    • http://peterdegendt.be/file/27450015194.pdf
    • http://studioingegneramato.com/userfiles/files/pavosogeporovetaranarini.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b00da325b---disineg.pdf
    • https://doan295doson.vn/namthuan/images/news/files/gakavas.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t21rh3o3oojifj7v81ljvl5607/49572731250.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=invitation+letter+for+church+fundraising
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db0b.bin
8cb4da17d9170de084b524f0a810717532a2eac0a0e6a75d4804f1d1967241df
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 17496 bytes
font_01_sfnt_off00010878.bin
b82630456a34a035b249d8e0961ac68425776db1d61ad9914079e7153ea00cf0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 10872 bytes
font_02_sfnt_off00012155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 16792 bytes