Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7e6fb134f724ef…

MALICIOUS

PDF

87.2 KB Created: 2021-09-15 13:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1cf9801f3e7a7355dd6ae0bd9ecef182 SHA-1: 0bc93f6746ca7c9871240ade5cf2469ff0374c66 SHA-256: 4a7e6fb134f724ef2d62e9a16fdac6113541e9b3f751fd5d343063211ce3056a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised. This pattern is often used for SEO manipulation or to distribute further malicious content, aligning with phishing and malicious file tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://onsale.social-push.cc/data/fckeditor/files/94279760486.pdf In PDF document text
    • http://zae.me/datafiles/file/sopago.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xavogasutebitixidunojilo.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sebizapoxomizoxivefafoket.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/fabokawaj.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/8515647846.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a333719f6bc6dd07a51cadf12700cd7/kawuzagi.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/53118503866.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tejeb.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0e58879a6---83632013027.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/36480474335.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/16132299445.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/gesaponegabasoxevuk.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/5f919292b91895638b46360434650322/57062122066.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/sikegapedefidejo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383fb16befa---xuresuru.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/fuwesilisojuwumigukire.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de91e69759---kobijoz.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/16583557957.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/95129344275.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f7308fbf---45876870800.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/34342637785.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210914052222883065.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/towutibonepufugunenize.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/panumerefa.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kesipe.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/19669020993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=cool+sky+wallpapersPDF link annotation
    • 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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 17804 bytes
SHA-256: fc12f06e7d2e36290a40c293ea8581019eedaacb6e202038a356012d2533e25e
font_02_sfnt_off0001379b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379B 10272 bytes
SHA-256: 01d62b1b38ce02ca4d4bf920c16089ef54175a4a57290caf27ebf5d8757cac0f

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