Malicious PDF — malware analysis report

Static analysis result for SHA-256 f895aeaf75f6d56c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 12:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 178cfcd421ae33305ce25f38765e0c7e SHA-1: 016bfffe12016b0a81dd4eb7e252ad18aeb3e15a SHA-256: f895aeaf75f6d56c4f7182b29565ad73898faaad4b4706e4c8535d8fc4d16152
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on potentially compromised WordPress sites. The presence of numerous external links, including those with 'utm_term' parameters, suggests an attempt to drive traffic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=how+do+i+get+play+store+on+my+android PDF link annotation
    • https://detectagsafety.com/ckfinder/userfiles/files/tukemud.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210901210523.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/dotilizobubesabugopekafad.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/kemone.pdfIn PDF document text
    • http://c-six.it/userfiles/files/ponipibixiwoneg.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/nugufuxigugataki.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/wiraripovujogiweg.pdfIn PDF document text
    • https://nyig.com/files/file/57063610491.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kuzirojobor.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614be9d2cf341---juvetujunixuma.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/56730231902.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/sobesikikiliditi.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/21396973799.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/62dcer8svd0uu1lp5n3tr36gks/femusi.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/64858523598.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c694ab1d95499769e7fccde530481e55/wupob.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/kemozulimi.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210913_66086D9C89B2FC45.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/gibuvoviwasiremumuveritiz.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/30314912074.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/1633853367.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/zidufafup.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210914105522.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/28879731580.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/k2m5baphpvv0g3cgg2glkcj4vd/dezinelomigitapasifetuv.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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 10928 bytes
SHA-256: edf44a0cf8e4a0ee944f2ad86ad6326ea41a7185657ac85da97c06395e1264ad
font_01_sfnt_off0000f26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 17488 bytes
SHA-256: d90710c80234bbb217f811b0538ecca932267db5f13801f96d1394f4934423de