Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e1ad44cfcd3ade…

MALICIOUS

PDF

74.4 KB Created: 2021-09-12 22:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dc71154b52def3f0a907bca2233104e SHA-1: 1b14d0138619cb41b90e21dd2850ec19d2e2dd91 SHA-256: 80e1ad44cfcd3ade45baa83fbf830baf6d35594322c6b475eb65cdf6cc025154
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the structure of the document suggest it's designed to lure users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130364124d45---tadoxejixudolezikudato.pdf In PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/3dc4a4645f0ccab79d021bd7771cb00a/81542830148.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210902_18B56F109EAE76EF.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/68104089056.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/kopovofifujagivutip.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/pamifaxumuxorepile.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139306f20e40---29111455240.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/55933675308.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jaduzidomakitaxumoxanir.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sitotububitizusokipezemi.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/acc51c87652503c8a0d7ca1b0be10ce2/20194776446.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/fafebenedifotituvufe.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/fafelerexos.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/97407321800.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/25559702329.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/53234073177.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/3664581733.pdfIn PDF document text
    • https://mauspro.net/upload/files/gidegurame.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/63049500173.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/90817102415.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd7f886330---75946145332.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/segarozujivosubi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee326a502---18734671115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=phantom+forces+espPDF 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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 10608 bytes
SHA-256: 72b739205dc41a26efdcdae8e50c26e46cd62a5ef3692f69c456f14ce401e82e
font_01_sfnt_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16856 bytes
SHA-256: 2eeb962cabc9c71ac2e69b33297878c5eb52072dd9372c4892a25b6feb7df18f
font_02_sfnt_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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