Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9731d48343e66a0…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 01:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf0e48b041f179f2a232723c7ce2b0e8 SHA-1: 15d1e1cbdfd4f48f235e8c2aca53492786e9c4c4 SHA-256: f9731d48343e66a02a470412c3493e4cd3dc9b8adfeb725a41f4be5dc11bcdec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=colloidal+system+and+its+properties+pdf PDF link annotation
    • https://holocaustresearch.pl/nowy/photo/file/99423236353.pdfIn PDF document text
    • http://parentini.it/userfiles/files/86975190557.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/41008634886.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/31d61255c5648a867f76eda3a3ec634b/nagupiredepimulapa.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/45009412996.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4733935369.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/ca35000d646dc42e67d0e42812a23ecf/motigagebol.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/55494ff7322da5b6d4740aa7489f14b7/kowinezikigipekoputuji.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/80944639614.pdfIn PDF document text
    • https://banghenails.com/upload/file/58140806110.pdfIn PDF document text
    • http://kco.su/userfiles/file/xobuzimigukikobozojesudi.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/82143711705.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/86427338990.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/81464896857.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/juperagidinar.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ce862137030---18340972137.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/8449e3d497b046c1f37cbb5717e04eab/42496293640.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/mopibenixeboleduxet.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ekcu9ik2vh6frlrh61pi37hpqh/jalebulomabegedixurofisip.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d31ac6b827015ffadb2225c498006e79/dolurixelonarar.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e953f2bc68---kiwoxawumikadulubuxaxa.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bakirowosaxaf.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/xakulakadajukire.pdfIn PDF document text
    • http://df-2.de/images/daten/file/fuzebuzepubujawamuzexow.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160825a4820785---87541033840.pdfIn PDF document text
    • 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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 17252 bytes
SHA-256: bb2fa366ea71b6e29e750fb8166244b121c8a01b8a736a7b796ea72522881032
font_01_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 10804 bytes
SHA-256: b3cac47662bf7033b6128eaccaf5e4158a2c6c313a90a65b1d10562001da6391
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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