Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d809131d3cd4f7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 10:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d918710f96ed7d24d8c935d919a6fdc0 SHA-1: 842fd418da7aa33222d8e7019e8d66e043e6d160 SHA-256: 94d809131d3cd4f743f6c6b6a586001e40b2fe7e0c998a1154f761ef02b3416a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://neboskreb-irk.ru/uploads/userfiles/files/bimetobo.pdf In PDF document text
    • http://megaprestige.ru/uploads/files/30586583549.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/ai7hbj2gh03la0975002tqhp36/xijewu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/81625100462.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/47628856999.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/duwovoboru.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/raxonivifome.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/52623993197.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/48013310377.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/nadononisupikagolegit.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/motajipenuzosan.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ul2om8dhbbds5ooi528ltgosk1/79138709840.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/84591796120.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/fefepupubamido.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109170730038289.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/55836702300.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/76821729182.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/dabasi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161406d4729736---roguwo.pdfIn PDF document text
    • http://denizyemek.com/images/fck_upload/file/tamanubudakesonunif.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/fisizilewizotoxofutetezu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e4ecd112ba3ff6abf0804ac45c6f5cc3/51278301255.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/95457592520.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/vadizudevezonorubo.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/88125227445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+lucky+one+movie+onlinePDF 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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10300 bytes
SHA-256: eff9ae1760e93965bba74af7956de45163df47e516007399a07432f33faec255
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16520 bytes
SHA-256: 92d49f64bf84973dd2bd916f7be2d58e1974b9319af43721826b6af85efce1dc