Malicious PDF — malware analysis report

Static analysis result for SHA-256 78fb7ea61042b9b6…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 05:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b11b434f7ef9ae66c50e6b5df810e93 SHA-1: 5c5e5bc0a47ea2eefee459b061c3061a70a7e96b SHA-256: 78fb7ea61042b9b6c8676a349c5f3a7069d2d467e643ff30d192790059c22011
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The document body was unreadable, but the overall structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddd2d4248---juxukesewejikevim.pdf In PDF document text
    • http://e-sportis.com/images/upload/75228537716.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/vepemara.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/regevoguzubunasad.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/rumim.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32169359110.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fedc5ccdf8---13061839271.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/zevoweku.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/vewezirimo.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/8963621477.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/2497106765.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zotegonugojodezofunoxolox.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/31305109410.pdfIn PDF document text
    • http://ucokampen.com/media/files/64199450232.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/75452687400.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/85318248154.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/dajaguxedatudim.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142da19eb039---lawirojabebumamesav.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/55a28fb8146b7cb38f95b7cb0cecc68b/87599191090.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/42238235370.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/1462420810.pdfIn PDF document text
    • http://www.grifin.sk/files/romuvomamikebe.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/18939514668.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/74480735908.pdfIn PDF document text
    • http://hijoin.hu/editor_up/xibanas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=where+is+file+manager+on+android+phonePDF 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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10840 bytes
SHA-256: 7539ef753c5e6e3ea0d66c938a5753673e1cf4591fa0515ed5d27eb7b2a4a776
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 17620 bytes
SHA-256: 0c29ca7f4074801a34638d18e5e439bc9564ecdbce41d2e785e69e5fb5db393b