Malicious PDF — malware analysis report

Static analysis result for SHA-256 921d5f4603c7267a…

MALICIOUS

PDF

85.2 KB Created: 2021-08-19 17:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 94c7fd455381b7e873f3026756e104d2 SHA-1: 86961892724e4cb169caa6e0c8e6aff8e4b67a86 SHA-256: 921d5f4603c7267a8c2e56438082aa761e6d4f9a1f424ca98c4e8898d06965a5
176 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, directing users to various domains, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sbcnepal.com/images/file/rifafipatejokipid.pdf In PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/15f6e490b8b3e5d6f89622e197fa840e/32956690595.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/femakiwasubal.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/nabunubusikuxazor.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/16514008511.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/20313428822.pdfIn PDF document text
    • https://datajournonepal.org/files/94646852123.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/5803436368.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609606546a9b5---99975719518.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9f88582b2f553d6f28e06bd51af16c2b/90415790436.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/pusixorisejuxove.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/84427790467.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f02004bfccd---wetowetowejapuviwele.pdfIn PDF document text
    • https://andrejc.si/files/file/40043172073.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/dikide.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/55023921984.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cde30d2f41a084e5ab3a86007c84befe/sinoxiduzonudetuba.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/779986911.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5b823e58---mixip.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f6e4c3241---welujefad.pdfIn PDF document text
    • https://area5srl.it/file/falenuwikilugefosene.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/14308722744.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/qmblit3dgg6tm557p5rmg9afk1/50589779383.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tematixakulezitixepedagif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=applebee%27s+qr+code+menuPDF 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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10724 bytes
SHA-256: 9928e1ca8b2e9aa94f5ac125fe006726bed2b9aa62647b807afb3ceb14422dc2
font_01_sfnt_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 17140 bytes
SHA-256: 2645774f267f25ffc9454a31b8ec4933664a3c47e9d3161e6a166c5bacea76be
font_02_sfnt_off00012e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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