Malicious PDF — malware analysis report

Static analysis result for SHA-256 4750a314f569a5c5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 01:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d429e0ff8eef25dd68c567fb81e2ba92 SHA-1: ce50a2e42daabaf5e13fbf715e9c835c56d3a4c5 SHA-256: 4750a314f569a5c5576840cc3e4378dd7337184f5ec4602f29ecdd1cdab46697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=dark+mode+in+snapchat+android PDF link annotation
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/56911762002.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/wekajasepulasafoxidimu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc47fbbe52---kovadujapedivi.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/fawosekowirepakixedu.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/kuzalefimibijukaf.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/munokedeforupax.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/085db157cd7c9e99a330242e15b47513/84873333659.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/bugamebikunegoredazokito.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/18982526215.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/legizekelutukepamuwonom.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/793559b401c9f7c6f0f01518a1eb4ee5/60616769718.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210906_225602.pdfIn PDF document text
    • https://tele-video.ru/upload/files/lesogifutu.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/42740924273.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/xeziza.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630857779.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e646f1aa3378e0067825eca7b7a75c22/dopojis.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/potojuvepa.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vadet.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/magisemun.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/riluf.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/nulerasuvaxeded.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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 18208 bytes
SHA-256: 4d9700ff12490a90362d905a4a6f27702b81fc60b22a14ab6db5ffa6fc7bb121
font_01_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10824 bytes
SHA-256: 9415210d815d827de35420a74c3bfcf5cac3d338c3824b273edfcabc42dd07ec
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1