Malicious PDF — malware analysis report

Static analysis result for SHA-256 4499ff854a7e713f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-23 09:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 369d60ea4538cf6550343bc07deb65e4 SHA-1: b1b2765dfb0473abeec0b48d89404df95df0659e SHA-256: 4499ff854a7e713fb40244097668282b5ca12149e57d738e8376e203fe57ed43
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other disposable hosting domains. These links likely serve as lures for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8075

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=and+god+bless+you PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d395bdceeff---lalanujugamadidivux.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b5298caece---jifizivudekeluwaderu.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/k57rs915g020rj2dihi1mll3uq/tirekanurubuti.pdfIn PDF document text
    • https://fishboat.hr/files/lumofujajiti.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/ganufu.pdfIn PDF document text
    • https://togeltop.net/contents/files/3251422442.pdfIn PDF document text
    • http://kotolantopeni.cz/file/neromigesalosofalenobeto.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/78916232235.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/tijijuzorisatukilako.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115fdb06fdb1---fesuridelegipupo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f1f2363b1---tirupufitusa.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16254778541796617466.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/24608069525.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/3636786069.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092d52d0adbb---65971356053.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210722094334.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/tevivejugokejil.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/sexika.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097107919092---kofasovopa.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/pmufolrcqrhku8so5ovopme71q/gerugajamefekepi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3fc6f53d35b9c5b6f19204bcb5f48b34/mupetezagufuxajumesewu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b858175f8c3---57805687373.pdfIn 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_off0000e115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE115 30020 bytes
SHA-256: e0640e6d119b5531149c5ef49bc2219b508535a63f9acb1d3c71f85325b31447
font_01_sfnt_off00011c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C56 10304 bytes
SHA-256: 8e2ecbbd77f5f0f74eed3bf342809af9642a220855bf6929d1bd5019e0931e5a
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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