Malicious PDF — malware analysis report

Static analysis result for SHA-256 1426341953fa9ce6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-05 07:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d1e45b773f5be396f365bed91e42338 SHA-1: 2028028a309666742782d4a0c67bc8555eee41ac SHA-256: 1426341953fa9ce65c86661c012c827481201cd9ba2c2250705d31f8eaf54008
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates an attempt to direct users to malicious or compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://technimexvn.com/images/ckeditor/files/rofusazamawomegigexigefo.pdf In PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/tojazufifudifofuda.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/72e8b5604eeb8b535ee0e491dbe1c06e/namedafanavomubalep.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/2965867711.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/porog.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd6f2a3893---nojixakijufexadaxobira.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ec9b9133ee5ee4100fa659913aeb5a5e/fugoz.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/nutukumunukibibarofas.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/dononi.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/ziruzawokuwefikemisigeso.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb51690968c---bazenu.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/52093531517.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/10892673743.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/74011816690.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/sifixotuneti.pdfIn PDF document text
    • http://zaiger.ru/img/file/33539665600.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b478f4d7---mavumitolewilaxuzuvu.pdfIn PDF document text
    • https://motoralbini.it/files/file/91901513236.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070605321735.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b253af3476f---94279966041.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/zovaj.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/12138440612.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/65060485841.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=elterngeldantrag+nrw+pdf+downloadPDF 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_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10480 bytes
SHA-256: 21393146b80fef3ee095b5618045e52cd658395059f63c4042d6cec911284f19
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 19312 bytes
SHA-256: 66d6c9095d6fcae4bd4056326b07f7ca3b0ff0d7cff7c711f8c72963e97f117e
font_02_sfnt_off000130ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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