Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb03e308f1a44c7c…

MALICIOUS

PDF

109.7 KB Created: 2021-06-26 22:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 000caff15bc3ec316d5f08bd659ff47b SHA-1: 57faa0ab23be2b0a393c8b2fb4f9e38fb7a2c0b2 SHA-256: fb03e308f1a44c7c278b3b6a63308fdccb4c27f144c841969b37d4b989103690
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=about+tom+and+jerry+characters
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ccccd2e941a915e7c5110ed30a056716/medalotulonib.pdf
    • http://onnetsolution.in/userfiles/file/88118334481.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a6abb55df---govezovenavetibivejifiv.pdf
    • http://fly.no1-yes.com/userfiles/file/56037855871.pdf
    • https://afra24.com/basefile/afra24/files/kizigix.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080d84697074---liduravegokako.pdf
    • https://ka-base.no/images_content/file/jojinax.pdf
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608143227f079---kalilajorabeluwopik.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/75ee8f572188a6137223522522f34a69/goluborimapitu.pdf
    • http://busanpc1.com/upload/fckeditor/file/zilepijidu.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d939484b75---vikarajizawemu.pdf
    • http://lycee-elm.org/userfiles/file/doretepamokofid.pdf
    • http://autodilykanka.cz/cmsimple/images/file/buwuzalig.pdf
    • http://duepassidalcentro.it/userfiles/files/wawavarugad.pdf
    • http://energo-winstal.pl/userfiles/file/82855858835.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2a09fc2e84137cf99c90735822751c74/39164362959.pdf
    • https://verandapattaya.com/userfiles/files/vuvokiwilevuvebulinila.pdf
    • http://thamdinhgiadaiquang.com/img/files/ninitu.pdf
    • http://maility.pl_adresuserfiles/file/jesozuvulazogakoso.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa29c46db1---zadijejenepaguw.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9673f43095c5637851b623e7b8e26abd/vidabukukokevifuxaviwuxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a29.bin
556e29c9691b3aa35a7050e618048b1d0fd9b087b1c5db9bc3c240e088521d3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A29 10964 bytes
font_01_sfnt_off00016375.bin
7a9204c3bbe6eb2c5b8bfcd99b110331e3751da017a712cb3dadcb5e0a98fa13
pdf-font-stream PDF embedded font (sfnt) at offset 0x16375 17992 bytes
font_02_sfnt_off000191bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x191BD 16792 bytes