Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4331c65d851571…

MALICIOUS

PDF

89.7 KB Created: 2021-07-04 01:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c203a9274cf0540c73b36866e925cdda SHA-1: 47e40239e341a22a09adea89b7046540d38d0a2a SHA-256: dc4331c65d8515711ef4d280d1d2585f701b5ecab0cfa451690a5f4b0086b045
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. Heuristics indicate it's an advance-fee scam lure, likely designed to trick users into downloading further malicious content. The document contains numerous links to PDFs hosted on compromised WordPress sites, suggesting a distribution network for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fafad0dd15---12965128951.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f5hcv029kojtoulbfc9vmcth40/3344349143.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607854d1925f8---83434282712.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5suv275e8qk7r8ji622vf8tin3/pudes.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/93e7c1e203f4c8a3ca2445e09000f383/93769586380.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/gopesediwukotaxorilixutub.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210621225314.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee82c88cb---92523387934.pdfIn PDF document text
    • http://effektfilm.de/files/file/dakelavodadenonikujeku.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ea3b3b7d53976422e4715498d9c6f9a8/zifarudi.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-4/20210504115257183607.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202162310758.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e639901a1969e0b5f05e0b38c3093941/dakodokikolom.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c000c3bf353---patapepiwazobo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd860b0d8---lolilapiwasu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ba0280677---81813263935.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/pigovarufumog.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607577b1139c7---64280341485.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/76385655711.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/19d1abcaa20c22c26ba5d410709fd40d/39434590715.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8589f4b582---73457290455.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/12813502022.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc4cdec944---bujoradeluperatufid.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/30392963156.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd496aa920---moronefiwuverajevojovuwev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+big+short+free+onlinePDF 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_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 10432 bytes
SHA-256: abbd2e4a3b09253939dcb701eac11c004377c090c4834fa2ae37de43cdc6dfe7
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0D 17420 bytes
SHA-256: 5c96214f0fed49c9a918053c4bfabd0523974e1112f4504afbdc52857e54e885

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