Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19913421aadee77…

MALICIOUS

PDF

86.5 KB Created: 2021-10-11 04:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f7fb5844afa99438432b6ee0876aa09 SHA-1: 4a049b09a3b7592bcef4896c0aba6df3c676ff66 SHA-256: b19913421aadee777ec42933f43dfc9108094e31f3a10cb283dd0a47d12a4fe1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://uniquehotelsolutions.com/files/others/jogubefukivulelumavotese.pdf In PDF document text
    • https://pima-alarms.rs/slicice/file/gosuwosejuzevupuxir.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/musilosanodumawutedadawe.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/gusosebabilesi.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/22042043525.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d411f29a8a---gerejokobi.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/benumidefowudiwexikawe.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614b16d18af91---13055167438.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/tosivuxinivazijokimopot.pdfIn PDF document text
    • https://lazerom.pro/media/file/64781830372.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/bitinakoxudaveratid.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/53468092289.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/wapoxijivologizofidot.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/19908097218.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002d03e798---58236291864.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/54269637977.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/95059107333.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210924223628_a2VrYXhpd3U=.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/66215480227.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/30824038015.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/zijuzodolulup.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/9448544397.pdfIn PDF document text
    • http://m2m2design.com/userfiles/soxepunadagawuponu.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/59676618195.pdfIn PDF document text
    • http://pruneau.d2si.fr/fichier_article/file/10327554171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lotic+ecosystem+pptPDF 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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 18948 bytes
SHA-256: 1f2e70cbfebb77ce542d3bdea1cc9e5e130871d187da2498ddf3e4805af4f8e4
font_01_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342D 10196 bytes
SHA-256: 9383d3ffd59c84d2496c354cc816002b81a51b2a5d23cfb06069eb145767cdb3

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