Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8306427a9dbf00f…

MALICIOUS

PDF

582.6 KB Created: 2021-06-27 01:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 304e3a7aec0eeb565bd914bf8be9020f SHA-1: c721c5b92e259c34a456fb7da13bcaf6866289b5 SHA-256: d8306427a9dbf00faa9a07d86597f50dc40ce993d835b062558dbf9d95eaf096
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that point to compromised CMS upload storage, acting as a link farm and SEO redirector for phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7542

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://accesoriosalmayor.com/images/userfiles/file/jatezix.pdf In PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/68316834340.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cd897ac57---70855392582.pdfIn PDF document text
    • https://aneri12.cz/res/file/73657642031.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab8bb4448b---vomutugolanameravalupipek.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/bunilipewis.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607365f6b28d6---29633777137.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bebozabizijigarelexobex.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/takumelutexusoduv.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9b7b0f276f2c5fceafc8370154837bdf/palilivovewatipero.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bd7dab8642c436f22d64f4cd83e13413/wiriwolukotapumibifetu.pdfIn PDF document text
    • http://computerdoki.hu/user/file/burosotoxoberugumezomi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33a3cd5f8---52374897280.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ss4o9fbqtro5lnc2quq4krgel7/funamasibazedop.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078a07414fba---82362417880.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e8d083d571e855cc1d50ff551d904ee4/babifoxevabejutisodoken.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/23865673179.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2ianpfd2l7n9vpd5g04c8uc72a/42257224956.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160963a4031647---wibiziwababigokavofo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ea1caac9ed53646fe0e07f84e710b225/moresewomujebotozibijob.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c95c78042f---pejaxeki.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/5snumr1aqorg517vscfb929bcd/21951659724.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/makuwifusuzufenina.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/nowiwovoxidoko.pdfIn PDF document text
    • https://tipresentoio.it/images/file/kavigeketuxivujovavakevid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+prophecy+of+malachiPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0008aa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA48 17992 bytes
SHA-256: 4de9f5f51c987a675415948911634d2e6b26b04910e2dce8115f59777d09012c
font_01_sfnt_off0008d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D960 10452 bytes
SHA-256: 2fc8f7b8779409027f0aa44b9e435b450b8d9671c9b1a8cfcbb3714c863adcd6
font_02_sfnt_off0008f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F117 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1