Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e4ae8b7e87654aa…

MALICIOUS

PDF

82.6 KB Created: 2021-08-16 15:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8657c7230aa43f7b656912125cccf7d9 SHA-1: 52fd6413c392707d3acfbccd09e41a96fe7aabe5 SHA-256: 1e4ae8b7e87654aa3209c70b7173f45c157334cce9bc3e588e7a370a7da1c164
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or phishing purposes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=what+should+my+ideal+weight+be+for+my+height+and+age+uk PDF link annotation
    • http://alliance-ltd.com/userfiles/zajekarisixonazix.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a71737f15---basuk.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079df5f638b5---8905251818.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8b907907---993150411.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/vafadigulonusobugi.pdfIn PDF document text
    • http://fxmeat.com/upload/file/052c74800c60872b09fdefdac034bc33.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/30802415340.pdfIn PDF document text
    • https://petala.gr/userfiles/file/69822822577.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/libujodenoduvowatafo.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/b57e1f3c0447518f7f67aea428a7c821/gebeta.pdfIn PDF document text
    • http://dzbnf.com/upload/file///gusifurirututasarudaj.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rurigorek.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/zonufoza.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8353967712.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/figatevejenixeva.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/fdb322b64830f2e94bcc13b7cd2c4c2b/buzubudamirinufokirotewig.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a99fd59d77---20406345797.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/xebozubeli.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa74b078ce---98084800220.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210707_90A9884F54B89825.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/51973925272.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65ecdb93e---segufubaviroxiwagi.pdfIn PDF document text
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/rokezobuw.pdfIn PDF document text
    • 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_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 17520 bytes
SHA-256: d81f18fbc95d82e66b7bc56dc790c04707948a6a17f2bc1d3c8aeb4731c27cba
font_01_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 11328 bytes
SHA-256: afaa9e63755c85be945e16e3a4ae52b52f7d2d5e45934552c6d10be721b16487

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