Malicious PDF — malware analysis report

Static analysis result for SHA-256 c06817e4a6fc5aae…

MALICIOUS

PDF

73.3 KB Created: 2021-09-28 06:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2dcf563442f2221e7bc300ac55a8012 SHA-1: 49a93ef80c602622ebbd639d60e0438b0822e1ab SHA-256: c06817e4a6fc5aaeac51cbdf28fbb446e5df997880764ac81f8b6dd0e1ac24ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, a common tactic for phishing or distributing malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://medvor.ru/uplcv?utm_term=the+fault+in+our+stars+best+lines
    • https://actor-conseil.com/files/file/71202125178.pdf
    • http://lpc2529.com/piceditor/file/71541850200.pdf
    • http://nensi.si/upload/file/sifejexasoratigaramaxusa.pdf
    • http://safaraval.com/basefile/safaravalcom/files/zomujaxunivaxo.pdf
    • http://autobedrijvenindex.nl/images/uploads/48025369726.pdf
    • http://dopuskvsro.ru/UserFiles/xokefe.pdf
    • http://artattack-concerts.de/files/file/38806828622.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9a23204a---vukadekimujukukapik.pdf
    • http://duplisite.com/userfiles/file/pejada.pdf
    • http://sp3siemianowice.pl/userFiles/files/24722944872.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161501494bc37d---pepulapojuja.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/jozinagosurutawezebeku.pdf
    • https://unibel.pl/pliki/upload/file/50145577959.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/55e19d6c8f3004a15df179abedc775be/lokifewanunamepe.pdf
    • https://art-gallery.mn/uploads/files/32101364912.pdf
    • http://bordahusfeldolgozo.hu/editor_up/31114603763.pdf
    • https://ww150006.linebot.net/upfile/files/20210913131529.pdf
    • http://rickgrisolia.com/userfiles/files/11016249603.pdf
    • https://pinyardim.com/calisma2/files/uploads/nesamuvibokixezemosepet.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/816d0daf9b789e3a50898d09f664d9ff/konaviwogutujewopofilese.pdf
    • https://doctmcooper.com/userfiles/files/47270586815.pdf
    • http://hoinhikhoavn.com/img/files/96176359917.pdf
    • https://hopadive.cz/ckfinder/userfiles/files/8969204989.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44aa25a3cd11377484822665c5cee7d6/negamesiwidavek.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/rogixufeloruxenobipitof.pdf
    • https://mihalex.by/files/files/dugukamekew.pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/gixulazetuvikesum.pdf
    • 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_off0000bad7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD7 16792 bytes
font_01_sfnt_off0000d2e9.bin
81cb1183a97033f87f942ef6fd11d4a69e5f4d919996c5a86b9f37b6a859c552
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E9 17556 bytes
font_02_sfnt_off0000ff96.bin
d84fd51a44140b521a64e72e15455d6684cb604b37c1975d9fcf5118cfc28ad2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 10516 bytes