Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb5560f9802e7b8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 21:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4e31d577a9302f52f1913eb39c295d79 SHA-1: a3ffa83c43c47c7cfec6e0f1bbdabf22f889c185 SHA-256: 7cb5560f9802e7b8066ec9503c960c0d707df1f0973446177b4acdf1a3e5cc89
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=ejercicios+nomenclatura+alcanos+alquenos+y+alquinos+pdf PDF link annotation
    • http://slkuang.com/v15/Upload/file/20218232052257960.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/38016231836.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833910ae1c9---99777336742.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/27b8pdqgc2vvg7ifm4q75mv3vl/11800746715.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zogasogir.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/jazemanofogagizijeworutux.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/faf9f3a805146bf3618681b8dfcda803/64081046435.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/rumosumarumexalivalaka.pdfIn PDF document text
    • http://hnspkjx.com/d/files/didafowowikogelida.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4de788f49---mikugixosujepixamatid.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jasusinumaranabejes.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4ea8f858b1c43a2053d43e27d49ef7f3/mikigabipizus.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/fiwopevifop.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xoxujuluduposituxoxodune.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210808181551.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e3d36202---76263296112.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/80194593255.pdfIn PDF document text
    • http://i-dron.cz/data/file/10269632166.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/93551554391.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/38v14s824ffv5rh7avddlqsptu/38605235838.pdfIn PDF document text
    • http://stattus.com/assets/file/rinumazanonugafi.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/34614260595.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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 11252 bytes
SHA-256: b08b889358c798eff2e0d37a98d2eeb678fa7e8b1ccd69b7a360e406a5e4c958
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 19412 bytes
SHA-256: bbae2e7616c15593107aec94ab056b1bde6bb171cd7023c8291e7a56cc28bc54
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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