Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f5e2741477fb95…

MALICIOUS

PDF

80.5 KB Created: 2021-09-23 07:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a69011a47d6044013ce4b98865e2df11 SHA-1: 221c04061ca956974ffebdd850883b418abe0e9e SHA-256: b6f5e2741477fb95504d7a15d18058a8f110394c698083d72cb153a5e49d2203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to various external websites, many of which are hosted on potentially compromised or disposable domains. The presence of multiple external URIs and link farm indicators suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=pes+21+apk+obb+offline PDF link annotation
    • http://technoprofile.ru/userfiles/file/jovusez.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/80999779628.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/kifubixuduxubawumiditunu.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/supemodilifip.pdfIn PDF document text
    • https://wonkingchina.com/d/files/51316057257.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3a564ebc---jebukadelegebiponapobun.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/wopemowaw.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ce4ccd717---12437533169.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/butufamopoko.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fabupaxulisamomekog.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/81571099630.pdfIn PDF document text
    • http://arablift.net/userfiles/file/lisadajesebijir.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5f5e8915---negezewo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea67ea01a1---japitotojogu.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/58902532785.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/mozesifibupobiku.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/6ad32d9f0a331ab6529684170c7e586d/gixepepexopajikiget.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/nilowajanebiweg.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/32889294675.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/jepulapinuminepuwosos.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/vonadukepalapibatuwifinij.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/63695073081.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34024188347.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/77868660143.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_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 10560 bytes
SHA-256: 55c6a894b2f0e95ac6f933ac061cb79bb5fe53cedbed2db12dbb18d6abd3e51b
font_02_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 18036 bytes
SHA-256: 1360fbf363ab28dc48feb2023114f4b892b03d8a412f73ad8bcf2aa86633b465

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