Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d18cdbac9efb1d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 09:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8702174e4ea6df59e28a49090aebce38 SHA-1: d5d23daa737b46b8c008baa491cd2dcc07f6c474 SHA-256: d8d18cdbac9efb1ddafd11a366895b19cbab04afb0bff750f1e5ebb302c2888b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=mc+jain+quantum+mechanics+pdf PDF link annotation
    • http://tuanayapim.com/rsm/files/nipoj.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161417007c5b38---nidireresugenoxigaripur.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/deponiliwovilolusogaxoraf.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313875ca250---20755916327.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/wadejubosisigig.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613122bf61847---66888291680.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/muvisumidepatiruvajil.pdfIn PDF document text
    • http://budka39.ru/files/xatoki.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/fufif.pdfIn PDF document text
    • http://medi-sen.com/files/files/gupifulefepup.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/nitagufukipamit.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/66981267222.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/57730083305.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/burabidetiruzogabaposedol.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/93404756467.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/fajug.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/sexapujopun.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/soomjb8tengriums6mtvd0j01k/79571834861.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/dunijotosesomilevuben.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/gezivogarawarolamoridokuj.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gam8ltvuo1mgdr03gsc8h24sv7/dujarixewafaw.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/nakokowozijigadajutoliba.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/77379611510.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/70636280003.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_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 10988 bytes
SHA-256: 043861e13f5ab9948bbab15217fa470226077bfe365295ece6cd8b30abe7716c
font_02_sfnt_off00012076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12076 19088 bytes
SHA-256: 6ac6c8399c1e6a6a13c37c8ae4977b0a996abe91122284e660e05bb2b9dd029a