Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0d422a9f0d7dfe…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73c7e58185b0789285b3ef2d42e368c8 SHA-1: b47c2436a53ab5255c099be9d024645239f968db SHA-256: 7d0d422a9f0d7dfeb441ab6eb97f59592adc1f32bc496ef9372e44615edd1a4e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/penuwevijewuderebor.pdf In PDF document text
    • https://morabia.fi/images/file/56871557916.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/78049458874.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/gizakiwodofafij.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/benilajiferuli.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/zesavotudi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b3aeb3cc7---78590855055.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0eab2f5f7---jumoganepegukefono.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/rabinawisam.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/dutiwefoz.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/dibivagan.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b6710b14---34899567879.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/kobenujigewitovaxoniz.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612179892a2e2---57684814947.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/3788603220.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dopedozazuwokilelewova.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331bde4288---bulejumamuvegoto.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/lepimigujezugatobajutu.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/rotabikeku.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/1314120546.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f01d4c041---vapalij.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fcba2f819---46361152769.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/20688913594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=leadership+theory+paradigms+pdfPDF 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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 16276 bytes
SHA-256: 4a8dcb1b675bb2b08b56ae3e65d969cd6af841805aa8ece548c1b2568fdd1f8c
font_01_sfnt_off0000f091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 10864 bytes
SHA-256: cf21c7fea6e9792ce9c3bea495e18ff60fe5eb4258683b69eb3fcc6af2fccae4