Malicious PDF — malware analysis report

Static analysis result for SHA-256 1557e77e902c4515…

MALICIOUS

PDF

149.1 KB Created: 2021-07-21 21:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b63a7a4713a919880f267ddae8f630c SHA-1: b7c1bb577f5af1bc2dd4d91f1674b311b4f03414 SHA-256: 1557e77e902c45152dac78356f1bcc54895795712d5197fddb084ad2915069bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised WordPress installations. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious or compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 https://noddy.nu/images/file/gefulodaxunupokiselefo.pdf In PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/8fdd0e7755572eb1179411cdd2c23370/pumuwevafelotogezikitu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf79d0280db---91480944027.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/mewefevatawet.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cced3ae27a---26391800829.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adbdebe508f---10209308035.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106261046508512.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/duwedoralewetutovak.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210621215501.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6a7a9a1dd89d46ff079d3995c5e0cb0/bizerulijidoxi.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/55806895267.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/57494136800.pdfIn PDF document text
    • https://brod-plovdiv.com/images/44687931608.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/21873789745.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608737a78074c---8159000602.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fb492760cd5679f8c62a3dbd44d06bc8/misojem.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0dcaad7fc---62840464395.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/negiwagus.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3f1c5140a694d33f15320ad1c3f60046/tazatoxugiboremupavukokew.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/58664236920.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/dewivuwodewizosaz.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/20202064881.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/varuxegadiwisav.pdfIn PDF document text
    • http://podushka.by/files/files/dapuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=shabbat+in+your+homePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C44B 18856 bytes
SHA-256: 3ae198e4bdc3e1e5522f715d837d2afe1e4c24205721d380fac221a776ee6407
font_01_sfnt_off0001e3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3A1 19668 bytes
SHA-256: 636d1e354aaf7d3fc6b3f5573de5e5d2fd5e667a5301a57a2f0255857c631e53
font_02_sfnt_off000215ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00022e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22E16 10588 bytes
SHA-256: 8e2d16591a784a61f5b4ae9227023a46fb4abc2f3aa9e3cda0119f4bbbba084d

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