Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81432471b749531…

MALICIOUS

PDF

92.2 KB Created: 2021-07-30 00:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdb12245cd434a126c11c1215990bd01 SHA-1: 71855d76a2870b72cbb126e7b83e2a2f559a338f SHA-256: c81432471b749531567576769087d82667fd19da54759320e6254bf64e493eea
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gamaconsultores.cl/upload/file/39849089113.pdf In PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e73c392ea085fa09327c63e27e1a7054/99227845539.pdfIn PDF document text
    • http://metal-test.cn/upload/ckimg/files/202107292317477717.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/7144e32445a2cadf987ef0812cf12dcd/78318751447.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/xukaxuxujimiburunijib.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/4243980256.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6260220e---valavomegupa.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/96c5ffad5e8f5103bfb0606cdecdadf1/wevivudofom.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/73268249276.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607022237f59c---90949325538.pdfIn PDF document text
    • http://mav-auto.ru/images/file/xubetevokaz.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7466738912d79aff2adff1536f2d3357/lanigodipifapoworajo.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58e36e302---vafezixugalupepij.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/gbg3n7ahsc2uo9clvrlo17fene/57285608400.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3df3b294---sosepadifem.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210521213054.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/a7362c6e1eaa2a7206dbb78376f9e7f0/bupofumodekurani.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8b4a46661---ludekerevakabulabekujeki.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/43803087635.pdfIn PDF document text
    • http://digifast.cz/userfiles/mitawemivagapuxewarujolig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+long+do+beats+last+on+full+chargePDF 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_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 17932 bytes
SHA-256: 3995bf42d51f66d4f139264968fc7f3ad38f46636c0d07e33c448d9e3905238f
font_02_sfnt_off00014735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14735 10980 bytes
SHA-256: f88dfe8fe2aef1e25722e772091fffbbb0f57f0b2b589bd2260f01ffa90f673c

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