Malicious PDF — malware analysis report

Static analysis result for SHA-256 227d2d3e2666e937…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 17:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d95313f19eb9f2a321177702dc4a282c SHA-1: e540a476886a2592804b7f887ff7675840771358 SHA-256: 227d2d3e2666e9376284ecc293b8a1c7ce0b9e4bee9ccfd1e63926e78e3c2991
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=computer+to+android+file+transfer PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161404a627579a---bufuzax.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109140251178235.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/koliwezizozuw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7e74c4783719a74e10ee7d6908a25ac7/36356830312.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff443083a2---nevibufaref.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jerewu.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/97708826010.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/adedc1c45e7290f1e10d869e4d552768/luletabefekekupu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/91139145703.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/wobogapesopopunam.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/3409420210.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140bacb6738e---jefubisobidefojolo.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/58959978967.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/ravefakapulamulowubeti.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/65729958371.pdfIn PDF document text
    • https://bagstyle.uz/images/file/gisejudejibab.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/32966338475.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/jonafagoz.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/rexajuxoruxo.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/70196797774.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/nabakixifaneze.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed4cc62ac0---35084773912.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_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 17284 bytes
SHA-256: 195701a40641621ce84eb75b0764537ab5aa52db072c161595f7b5dd58fc543e
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 10788 bytes
SHA-256: a82d0942781f5b68deb469b9d069a4f527aac1a9ba132beb761c98b42d6ef776

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