Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e20879f91777014…

MALICIOUS

PDF

92.8 KB Created: 2021-06-27 19:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4e0c9d47daaabeac3ba7853f792b860d SHA-1: d25069fc94cd4c37c98004cdc59978bf87df0b16 SHA-256: 8e20879f917770146ff439b50b437af535ec2549de03d2c8b89d2ee1f827a4a0
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites or disposable hosting, likely intended to manipulate search engine rankings or redirect users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=difference+between+orbit+and+revolution PDF link annotation
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1045a8dd0---mojomerovokidekefi.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/6bf180a86afa1af3b642c4afecb86b67/72772728894.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/japopufidale.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/rinisurisalomononuxumow.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/23651480165.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/46468261153.pdfIn PDF document text
    • https://soechi.net/userfiles/file/47630919306.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182c774f79---68776990497.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0cb609181---sedawamapolelozexoge.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/dc72ad65d5154889912dfde55a41b575/99819344072.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/83039888003.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb15dab8b8---jerijuxixodewajetaguwugen.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/876eucgk6e8k9f4r3vskbdbs24/62697836537.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5037dbfab40904b24bb4ff535eed4d2f/36427049068.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160857ad78c722---maruratekujaxosagilew.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/d454d2c6fec02ddf0fc1469c9f35c36f/15596537417.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e47e41e4---62118849333.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/e8d395bfafb6a2e1081bdd95682bf5c6/4320170069.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/a4082res55koof37ab8gmjq2lr/15649905441.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nutisuriresewetejefam.pdfIn PDF document text
    • http://allasclub.com/campannas/file/67219095158.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1ac13fd4d71b5478f51ed382d0e7b630/58353747809.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b246113064b---52910586413.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a31f14b066c22641e9566793d9dc946f/80577794969.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/34703ec10eaefa948ae4a722d08620ce/42200412885.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/55171044863.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f4e9ea5d17b5468ba7648914c15d2034/27560373666.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 10696 bytes
SHA-256: 59c23e45d17ad665171f0102bcb99c8fc36a92a61ecf30602a4838d26f753575
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001388a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388A 17044 bytes
SHA-256: df05ef876c69cbd3c0adcb9a56193e47f28587921f160014f4da29062e954b64

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