Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d6c9668f787c67…

MALICIOUS

PDF

77.7 KB Created: 2021-06-29 07:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2a4afda7a03e4fb658b5d8a71be6508e SHA-1: c740f3488d583fffc9cd0ecb1f48145714727d83 SHA-256: 51d6c9668f787c67213a4d10ab46bc3fdf73837f23bcebe506d1123e9653ec5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users into downloading malicious content. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8000d1a09---9583075148.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zagokuwomosedibogoxuzivuf.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609d985aecf01---vejololonata.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/bf933a3f76bc6b4a31dca837174cbde2/20945207442.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f5918d1a4d8ff4fcb550ec8106609983/5593312008.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba783dcf7f4---magelosunumopoxulotediwal.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/03174a737d02baf38532c858d90711e3/rogugurota.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160968dfd34e28---xakezarazabux.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74ed76fc2---39421500219.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac159becc---sapaxupijewojabukibirituj.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/01d708c7db3b2300e6f8e22cec062cd3/gumanutipuzikakaluxif.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/38575974152.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/napavurenipajugane.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/bimavomexupofel.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/pr0nqhtaffjd3a2l03pnhdu534/8211560214.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9361ccffc---rexiwetefav.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/78167204338.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/faxobibatu.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/mifowezomunotirokesigibu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac247a3277---tebujepisukadisipupemik.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca982a4a5b---todebamuguxen.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1704091090.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kiwezepanup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=times+of+india+pdf+downloadPDF 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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 16088 bytes
SHA-256: 27523b581916a8fd4377bb8aabb644b38eece358b4da914009f53c2cbfdac79c
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10508 bytes
SHA-256: d432e31aadcd0888760d36b2e62aff140d9a317309b766f30928bd175507aac1
font_02_sfnt_off0001119d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1