Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa068fa4654c598…

MALICIOUS

PDF

84.6 KB Created: 2021-09-15 19:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b6ef689f8a99ed108c33618467fb39d SHA-1: ab1f36ab865cd6701f9a0a030acc1d6b37febe18 SHA-256: 1fa068fa4654c598c690e7c3e698633c4bf33ec6c84c07d53b387d6c881a2dda
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=faraar+movie+download+720p
    • https://angkortaxiservice.com/userfiles/file/galakukakidebanusel.pdf
    • https://fsreloading.com/userfiles/files/99768385158.pdf
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdf
    • http://lnianemarzenie.pl/userfiles/file/lozexobakanabuwosoxim.pdf
    • https://dursunguney.com/userfiles/files/levujibene.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e29e9a2fa---vubinot.pdf
    • https://fetogram.ir/images/upload/files/19615792310.pdf
    • http://photo-ostrov.com/ckfinder/userfiles/files/61264864947.pdf
    • http://thuduchouse.vn/pics/file/56144127078.pdf
    • https://hotelite.in/userfiles/file/ruxelerijowazitunowuwux.pdf
    • http://stadion-zarya.ru/ckfinder/userfiles/files/32511623725.pdf
    • https://deepex.hu/hirek/files/jebunadunawololupefu.pdf
    • https://tasivn.com/upload/ck/files/61674138789.pdf
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/dijoref.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/tojakokexevaj.pdf
    • http://matras-devison.com/upload/file/magefetekopokisevenik.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162c448ff0---repamunasumusiju.pdf
    • http://ordineveterinarivenezia.eu/userfiles/files/gatelux.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rh23tr183omvr68i6ga6rj1qi7/39001127648.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/wanudin.pdf
    • http://plusk-car.com/js/upload/files/86747735277.pdf
    • http://ijfbn.com/editor_up/laxubisawilijawikedujote.pdf
    • https://autonoleggioassereto.com/file/rozowikifosegozeza.pdf
    • https://hnhaa.com/userfiles/tnejp/files/70684307174.pdf
    • http://speed-r.com/js/upload/files/wiwotejikix.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_off0000e74b.bin
6cfd65dc07587156585077094d56547b5152942e5f3c4838bdf236905c9aabb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 17256 bytes
font_01_sfnt_off0001140b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140B 16792 bytes
font_02_sfnt_off00012c22.bin
2a55416f1e2802df81898e4f6e4c6f23808162b6e2d5aacfe323bb3a8e49bbbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C22 10708 bytes