Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f25d061737b0823…

MALICIOUS

PDF

84.5 KB Created: 2021-07-20 03:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 9aaddecdd40eb3be610b370ec247ab91 SHA-1: 9527b7719f9af98186fd96450c9d15dd0e8ec12b SHA-256: 3f25d061737b08233cb9ca8c953dd42ca8da13e4dbfc857634489fc2e2692d0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other potentially malicious sites. The document body was unreadable, but the presence of numerous URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607620a71a59b---wumamijukupamu.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/18058392939.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6epljhh1kqg3d5omlso8euae2m/rufawovosutabuze.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc471b81c9f---xagenowavaluxam.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kolokuxoxuzujiwatiwafuve.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e79b84ca414---93713849910.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/leleji.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/vikulana.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79b2b6006---40511930479.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/54545424611.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160952f9b90730---muvosuwugixelutuzad.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/rsbv1ipjd2g39daosfa9ds7a2a/tapinujesaluzulopago.pdfIn PDF document text
    • https://activepymes.com/pub/file/pegeveparelogumerupirasa.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/12302665889.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guwira.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbddbd38bd---xadidagofosota.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/4211985241.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sazizunikoputugowewi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/416e7651ce401cd38d0384e97e3da3a6/95501064695.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/04591ef05ea8511265fcc4b86f1885b7/1794878456.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/19667601753.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b54987286ab90524c9e273987e994fc6/vimudufudamofefesurunafo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/38231712128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=religious+happy+new+year+imagesPDF 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16740 bytes
SHA-256: 82926e6329f16f77315b935097679a1e5ba8e2a01ba0086d5d1b30539385eb89
font_01_sfnt_off00011384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 10948 bytes
SHA-256: d39657389475eab38d0212dfeb666caf7a842f39750b847f79099619396263c6
font_02_sfnt_off00012cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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