Malicious PDF — malware analysis report

Static analysis result for SHA-256 382619737f293afa…

MALICIOUS

PDF

86.3 KB Created: 2021-09-13 10:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d77c46916f160bd950d19b08faae77f6 SHA-1: 06bc9c419ac1a17127e05dc3b8a69b36727ef147 SHA-256: 382619737f293afa4efa17f769443799d6e69cdaf788b338bc5eeacbb0c1fd1b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised CMS upload locations, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. The presence of numerous links, some using UTM parameters, suggests an effort to obscure the final destination and potentially track user engagement with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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 http://nhakhoauytinhaiphong.com/upload/files/67822388529.pdf In PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/49720242311.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a84fee0f704c4da100cf45f6f98c172b/19336468970.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/56458184139.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/cmmmqj372as4hc13m6f5b54j2e/96995129618.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/98380549489.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c0534cca---voxawuwiw.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/daguzeziriwixopum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/onjir0jtvu2ob85mft4ru1v4ko/jireboputefikupu.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020513534871.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/lukisobifudo.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6638e90e---60776869345.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/87406710153.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/zezinud.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/9455066325.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/pupipopesenisudise.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/24690055708.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_185301.pdfIn PDF document text
    • https://gulamanis.com/contents/files/53953177212.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/sosiwon.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/56842973418.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/nijumi.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/67686691848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+legends+bang+bang+retrieve+accountPDF 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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 10844 bytes
SHA-256: 7561a9676e2afc6a86e69b68dfda354df9831b2d8b11bd77004599fbf1c99d9d
font_02_sfnt_off000117a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A4 19180 bytes
SHA-256: 85e577fe79f51bf7d7da53fcdc9e7b1befed70254570441b261bdcc3e9510c2d