Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff0b7577b0e7a01…

MALICIOUS

PDF

86.8 KB Created: 2021-10-04 14:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9e070a43c83da53e6a4bffd3ef573c7b SHA-1: fe7e36985b02ea63e9a489465c30adae28c436ac SHA-256: bff0b7577b0e7a018d60cee8fb1de6f70382984018bbd12af245826ec9eb708d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to malicious websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute further payloads.

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://chcial.ru/uplcv?utm_term=cordierite+thin+section PDF link annotation
    • https://veriniams.lt/userfiles/file/74547034682.pdfIn PDF document text
    • https://alutat.com/data/file/91349340732.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rivuzewigemugetaki.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/jasajugofukixifixativi.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ae730eefb956fd0c055447c21c13da30/wibupizizejegunop.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/51456675023.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/nutipekuwunebagudalifel.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/30234087714.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/besapaselalorifetofe.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/milomexijukefufejufasid.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c77885e351---jawisejiranigijijukim.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///gevibuwezujawe.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/43782638091.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/sepexe.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/zetixixedu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fb921e4741bd0b5a5e0a2b83a5569789/kinojuledewinek.pdfIn PDF document text
    • https://seerupit.dk/assens/file/53491488915.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/81114882328.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/94560437057.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/70392607592.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_861E8350C639BEB4.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161584a4d06795---turerunusulifukisemax.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0r27fukk2bs8a764jl9abe0a40/fitufix.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/jatez.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/goguduvolagolavi.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_off0000eaa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 10288 bytes
SHA-256: 6a015122ca0f373e5e04988d3035cb93ac3ff12b69aaa1a08a44a1e05573bed2
font_02_sfnt_off000119d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 19736 bytes
SHA-256: b3b7c25af75a80f2a9940cdfb500267bcb6342d41879935f3b1376e1c8ebc63c

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