Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e1c1c410e51a9b4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 771eb683e228813b1f769a175abe0d37 SHA-1: 705efb5b335aba3a34be8477967931c6c07ac139 SHA-256: 0e1c1c410e51a9b4d4be2b940607d7dd854e4eb4d4e2d3e4173f7980cf98fd8d
124 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the download and execution of a second-stage payload, while the link farm aims to redirect users to malicious content, consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 https://krisoc.ru/uplcv?utm_term=jeetmall+app+download+apk PDF link annotation
    • https://mrpressconsulting.com/UserFiles/file/doraba.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/romuzawif.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wepelituvirodijorosuw.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161363b4483712---goketoma.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/11862792079.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/bopixe.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/95874456274.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/83000141040.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/48657521848.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/mubunasezunataluwukedi.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/1532218904.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/kizegudujafuw.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210919143621.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/3804885933.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133040ecb067---12737413407.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/jerewewuwuli.pdfIn PDF document text
    • http://schokofontaene.de/idata/tuvixo.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/befimezufinenaborab.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630624010.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/21dcb03c0ab55748047aecc12438c229/82371221422.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/60093851729.pdfIn PDF document text
    • http://abwessex.com/uploads/files/66236245012.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/dapavunevibadileduzoba.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a07f102ed---lukexuzixekim.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/95587830197.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_off0000b284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB284 16592 bytes
SHA-256: 0a876db0b9a91f8e8cb7f784c0022a918b6df6b41ac3259df80fac1ce6166933
font_01_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 10364 bytes
SHA-256: 74fa409bc9bacd6b2fc8baafab563639e5177e656169ba066eb75357d00dce1b

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