Malicious PDF — malware analysis report

Static analysis result for SHA-256 432bd0a496415d8d…

MALICIOUS

PDF

97.0 KB Created: 2021-08-21 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 734470127b4bed728d9ec373968e3d1b SHA-1: b10bd7863bfc7e7b186b173c18da8f08c7b527be SHA-256: 432bd0a496415d8dde4ec800f8f330fff28035ef2f4d2953efac94bd24e7858e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host or redirect to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for link farms. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/55056f49c45527c18600e1e9d6eb2ab9/13961175645.pdf In PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1229ae691---12232308828.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9ccae061f606fbbdff04ce664c8468e5/fawerusopogeb.pdfIn PDF document text
    • https://digireg.lu/upload/16118612839.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/0eb2e42ecd5c31ffba59f0d35b189e45/juvabepuxaxap.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a083b4153af---93724517509.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3f08305c---fajivajikozuvajeni.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/2nvemf0b3d9ed4j5ai6n28f19r/wotifenel.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45153bbc9f---50503481581.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/koxokeb.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/ruzanapitisanevuvubozozoj.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/dikal.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d4d71189---lakumatudosebe.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/94372073983.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/80184934227.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/gepupewagotenowivojal.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081223131073499.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3aae8cf2d---84637971226.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/90042818840.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tavakulepexajawo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ee49dbc5---ladaf.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160766b7e36772---84285816447.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d5d93fdb52bf03d6584014686c8e519c/42802685589.pdfIn PDF document text
    • https://aneri12.eu/res/file/64840360387.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29bff3e39---xagemufij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885d3de80c---15502115110.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e2398f2e857a83bc1074defe17a1119d/wikisanowujed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=calendario+2020+con+festivos+colombia+para+imprimir+por+mesesPDF 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_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 17812 bytes
SHA-256: 2a50c0762f628d53ffdea9a6dc1ce96f4157380cde459703c4324f00fac4eb79
font_01_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 11260 bytes
SHA-256: 37a77252b3d712ebe8bd6b7defba874601c2e64d059a19a47b77f236399a5fb3
font_02_sfnt_off00015a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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