Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddd0ecbafb0561d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba92815f9206db2755d41963bd8f01fb SHA-1: 0f1e5e7d8778978e3621720271c61a14874b0cb8 SHA-256: 2ddd0ecbafb0561dd81567ee85338a811daba8e619ab1c3f668d82c5589af711
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pasaru.com/upload/files/46568285617.pdf
    • http://platcometals.com/images/file/kuguluzo.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdf
    • http://k-sta.kr/FileData/ckfinder/files/20210907_682EA43386F9BD9B.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/63486509945.pdf
    • http://tks-forever.com/upload/2021/09/01/file/jaburovaxikowekotuxiluf.pdf
    • http://sxsasa.org/images_fck/file/1630745954.pdf
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/45285697237.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b365a378e---tiwakerune.pdf
    • http://nhactheducthammy.com/upload/files/wepelupexusozo.pdf
    • https://fasleh.net/Files/files/69338605810.pdf
    • http://armanetti.com/images/juxakilefebilidutemibiw.pdf
    • http://doubler-son-capital.com/photos/files/minagogewovowewu.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/kigaturunolasedul.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392cde5a4a7---bevikozusenajimude.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/58083541898.pdf
    • http://eperon-kochersberg.com/img_db/bekuzitozepasij.pdf
    • http://unstitchedfootwear.net/files/file/zomusipibudutazolez.pdf
    • http://max-metal.pl/gfx/file/bikoletenoja.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/jimuxuxarutulogagij.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/rijititijek.pdf
    • http://keifo.ru/ckfinder/userfiles/files/61182378224.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/65798139843.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613154a1675b3---46139612721.pdf
    • http://veterinariogiardinelli.it/userfiles/files/ratuxanak.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/31447776061.pdf
    • http://awarelaxcentrum.cz/user_files/file/31517816475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=diablo+4+ios
    • 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://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_off0000e55b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
font_01_sfnt_off0000fd71.bin
dc305f629db7df08666aca1a325971ba0f2abc28e305abe92deb871cfeefcf96
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 9888 bytes
font_02_sfnt_off00011353.bin
91ade60cda22b9672deb3092b4b9a54bd485a866e9e4ae3e8bc1193d3f7abcd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 18000 bytes