Malicious PDF — malware analysis report

Static analysis result for SHA-256 88494df71d606243…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 01:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fb04eb1526a4012716ad146b31822f9 SHA-1: 16c17958d322d3a3cca342b0cf48341292ccb747 SHA-256: 88494df71d6062430bd15310b5ca11b842aa0779ffd5ee39b1d31fa343dd2df9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://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_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