Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b3c56a56bf0c35…

MALICIOUS

PDF

87.6 KB Created: 2021-08-10 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1fb8376b659bb892210e30a6f9a38274 SHA-1: 34286466ed34ad7c82dff78b1e86cc5bb0d3f0c4 SHA-256: 75b3c56a56bf0c35c9a95890a33d65dca25a2730887795195cae054a40bfd836
156 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. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ototavandosemesi.com/resimler/file/88044911878.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-13/20210513023706578742.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/25648739053.pdfIn PDF document text
    • http://parfumland.sk/upl/jaduraba.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tuted.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160963ae45fe74---zepemegagifub.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nuxabaketeraxe.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/vesofidud.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/17c7b6852c922bded5a1bc97060fe8f2/83267416918.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/zadedemixunopi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/fd1fc47af86887cac3b1f8c7792d4c25/58849953408.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c674ddc9933---vagis.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/18648435547.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/856668653.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/1d418649551da8ed2b12a62190783be9/15910925187.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/40764420146.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/silizimepuku.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcd99ccb39---xopolekazozitosa.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/sifinitixodojuxuzexuno.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/590fd0dcbaea3161207ce4fcc49ac596/69364805235.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/39846134159.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/m99li2bak2cl21bgq01i97cp19/fofalegiritukiwopeme.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae27ae0a163---83946438279.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/55130647208.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/jetifosuzimumesovuli.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/fefegisefog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mortal+kombat+11+android+google+playPDF 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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 10956 bytes
SHA-256: 405938992d5b81e29695d2307b0bd9d866a5edcb87615aa0b06fc248787bd389
font_01_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 17644 bytes
SHA-256: 5093011e4c52bb600af4d741c9b0125a7180f2783c1ea1508ed35b3f0e9a7d21
font_02_sfnt_off00013788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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