Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09af4bf58082649…

MALICIOUS

PDF

86.3 KB Created: 2021-09-08 23:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f52ed01248abe86aa8194666df07f11 SHA-1: 108f9fcfee5d9a86a01edd6866ad3eba707b2083 SHA-256: f09af4bf58082649b62d403f789883f2d28d3302cbfac4959109bd45ecce13ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm characteristics suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wskinbody.com/data/boardData/files/19975157510.pdf
    • http://theheavent.com/userfiles/files/fozitudedapo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9f112509---70418976404.pdf
    • https://drinkpoint.com/uploads/files/taronogasimisefovezewu.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/zesupitolifujodezawomeso.pdf
    • http://phone-server.com/userfiles/file/gevelisemilexe.pdf
    • http://krakow4you.pl/krakow/files/77402181083.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61484287180.pdf
    • http://henzefashion.com/userfiles/file/95602900611.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f8237aa---misaj.pdf
    • https://ms01bet.com/contents/files/23582860564.pdf
    • http://kompletucetnictvi.cz/files/file/gavob.pdf
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/kigugebererenubifisone.pdf
    • https://ferado.vn/userfiles/file/tijiwenen.pdf
    • https://zibarajabi.com/cache/fck_files/file/98814185411.pdf
    • http://sabaispa.net/userfiles/file/46880712611.pdf
    • http://highspiritsmusic.com/ckfinder/userfiles/files/gexuwesatirasadinedila.pdf
    • https://ecosolar-energy.com/piceditor/file/wagosum.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/744f5d49c1bed6b96bfb1eda3d7f792b/junedovawus.pdf
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/39056266550.pdf
    • http://filipdegreef.be/uploads/files/tuwenawabiloropalupiduso.pdf
    • https://highlander-inn.com/assets/userfiles/files/70603524954.pdf
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zaboserojikewexigop.pdf
    • http://szyoujin.com/UploadFile/file/20210901061209446.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5k4cv5m7jj39gp4mc0hdiononq/depiwipavoxupuxozalife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+apps+like+lucky+patcher
    • 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_off0000e8a7.bin
3a18505c45f982ce0d171efdd1badb623f1a2e6813aa2ea82261cdca8e5d1db6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 19408 bytes
font_01_sfnt_off00011b28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B28 16792 bytes
font_02_sfnt_off0001333f.bin
07d431f9152b0ff68ea48010fb8f58451af2d2fdcf4310ab9b3e5aeeb64c2904
pdf-font-stream PDF embedded font (sfnt) at offset 0x1333F 10608 bytes