Malicious PDF — malware analysis report

Static analysis result for SHA-256 377fb9a42f44bf23…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 11:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7c2967effa7cf517ad5541e4921bbe7 SHA-1: 29f94ac16a3e17005e1e07642c6ae64ddbe66db6 SHA-256: 377fb9a42f44bf2351c0eaff605ce698938b5679c3a30fc80e4536cb26b045bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to potentially compromised WordPress upload directories or other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/maqfvod3mho90jcvhi6vs906gv/74640915756.pdf In PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/tolalidovakilapo.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/12187769290.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kizime.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/34982604810.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb62a0ef05---37581352846.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/16635901850.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/zukezovoxufelogonakivarot.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/27701008402.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/o3vf27td0241tjpgtms5nocis1/96804261568.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/19157951431.pdfIn PDF document text
    • http://jadeite.ru/images/file/sejamijoxo.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/8dd842777a90d7d6fb01cd4548ee459f/64753216740.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/dibupiva.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a2ef0ab---jotifavadatomipatudixaz.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/41250235212.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67023372971.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/41935203194.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/pojesonat.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/36204877727.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/mofewanavowodeviredaz.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/xikevixafamurolobutaduw.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/81512201009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=mobestiary+pdf+freePDF 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_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 10588 bytes
SHA-256: 0993340705b58a65ef6aad73b0c017ac74480a4d6d110fe17fb13e271efe7b65
font_02_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 18176 bytes
SHA-256: 3e7f0f5d5d07626872560fc731df7c77bb81d33ea7e93281a46f283c83f2e983

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