Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7220c91cd1f6cf8…

MALICIOUS

PDF

95.9 KB Created: 2021-07-16 23:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4005b3607dacf97a9291422e84b1b1b9 SHA-1: bb57b06bc517c4f46772b3c5b3e614b36d0b255b SHA-256: b7220c91cd1f6cf8b7bc2b99ab002652a5f82c995ae71aae605afeec347d4284
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The presence of numerous external links, including those hosted on compromised WordPress sites, strongly suggests a phishing attempt or a redirection to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • 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 http://bajajsports.com/userfiles/file/96379186026.pdf In PDF document text
    • http://garagehayashi.com/js/upload/files/podisipifivegeso.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/xepizadonikefuwakiwixa.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/61212237206.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160703c9b60815---97759986355.pdfIn PDF document text
    • http://fairmonteast1969.com/clients/876766/File/dulajovenejexexaxapebax.pdfIn PDF document text
    • https://majubesar.info/contents//files/tanim.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/73367871601.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/gevedewakopifebe.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/35502580339.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/zizomugof.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/6a8714c1c3efda2d3cdfb12cfaade4a5/kagajuwodikapex.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/malolemabomumadafu.pdfIn PDF document text
    • https://brod-plovdiv.com/images/56602705544.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/01agn2pqck9mn81t1ecnmt34q4/76103763164.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/a50b1dec70cc8caa4860783a343b740f/bumajeturumega.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2249621a---88950254243.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abcba71228d---88225924917.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5ddfcd0304ab677245d1d082e1263f7b/sipadudelubikivu.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/55518300216.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/m5hprtql977u80ramshe84tgbn/53937983920.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ce7b48d3---ganonutubumalanax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c663c6cb---sukukerod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=states+with+highest+hiv+rates+2020PDF 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_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 10584 bytes
SHA-256: 5671f35f493ad91e0ee129c71aa9e58f21241f98687065460a196a6ceecdd341
font_01_sfnt_off00012b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14338 17308 bytes
SHA-256: 58b11d0345807748aedc4c1218be84c2bb4f06d22328ba08362db3be69883987

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