Malicious PDF — malware analysis report

Static analysis result for SHA-256 c022a05a7ddaa3ef…

MALICIOUS

PDF

72.9 KB Created: 2021-09-16 04:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9ae50cf4113eef9fe87c7630509de8b SHA-1: 34d7c8fd4dcba178b33e4f09932b0d6b228d47fb SHA-256: c022a05a7ddaa3ef7b012a7e37ac79d6bf1dfed6d4a5a811da94d2c1aa03542b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The presence of external URIs and link farms indicates a likely attempt to redirect the user to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pistant.ru/uplcv?utm_term=download+wobbly+life+for+android
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0099c1b43---20100973735.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19428bec5---52354288974.pdf
    • https://gamepinleri.com/calisma2/files/uploads/kijikirobosodibazeji.pdf
    • http://remont-etalon.ru/upload/files/93753545245.pdf
    • http://mcutech.net/upload/2021/09/file/16312965321892461498.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/povusurexamog.pdf
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/resibisepabozukomeboguzor.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/5246959473.pdf
    • http://szolnokepul.hu/userfiles/file/garifujaxaboge.pdf
    • http://bfttacg.marketsearching.com/upload/files/93063165847.pdf
    • http://eapver.com/upload/ckimg/files/202109121433002892.pdf
    • http://www.ap-arte.ro/fckupload/file/sononinimupemowivebusekev.pdf
    • https://sukaunited4d.vip/contents/files/nuxevofipusum.pdf
    • http://vaithun.net/upload/files/nomopizadesotufasiw.pdf
    • http://ashole.hu/UserFiles/File/rubepupirapugal.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/74651846514.pdf
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/72067541273.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8d2cef0a83f68e9240e34ab40ae05442/44180350535.pdf
    • http://serting.eu/userfiles/files/5401908252.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/fiduraledozowob.pdf
    • http://hennel.hu/sources/elemek/file/40060837366.pdf
    • http://abwsalisbury.com/uploads/files/41989926645.pdf
    • http://spy-military-labs.com/userfiles/file/69253961247.pdf
    • https://tanhaithanhvalves.com/quangcao/admin/file/85040590318.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b80f.bin
57c44a54911021333de6399db7fce820bec50c1e076b85fb9a287721c569f8e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xB80F 17668 bytes
font_01_sfnt_off0000e4a5.bin
88b63279c687d8ab78f0684a96e1285a5c1736c4c4a6d97241d1c1a3b645976f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10420 bytes
font_02_sfnt_off0000fc61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC61 16792 bytes