Malicious PDF — malware analysis report

Static analysis result for SHA-256 882b288dd7fc6430…

MALICIOUS

PDF

102.4 KB Created: 2021-07-02 19:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a2bfd73758b3ca452df7fbb6f2faa8a SHA-1: 2da96c7f07411c2e73d136729222293030cf6423 SHA-256: 882b288dd7fc643057f1798406a81d23e63c84a89a7916092baadd1ab12ef380
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=me+and+you+is+or+are PDF link annotation
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642d4982e2---tofajuponebetogadokavumu.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/36323429482.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160823182a8487---63721011560.pdfIn PDF document text
    • https://badoza.net/userfiles/file/mepezavitirisifonedipubew.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9b41554d84a48543538eab85d9c757c1/petudelezajasadewepuvefex.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160865141f0b03---88390637802.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6evpcduq8tohgftqc12k5hf1r2/tuxadibojagag.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b779f847793ba3d6369980664a81b2c3/fosimova.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a5247090a---xijupipajeku.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/12/pobutunaxa.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/gizosudulizewigalig.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gogaravedexikiru.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/gusozu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/38689b008ad4e3b39187776d8dfc8d04/36465041463.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/56ssrlv0d0d9huf5q6fbkpfbl4/talumerebopigorizena.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/15891191544.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4da06f607912d4e25a0ed5a6c10b0fe0/8736696084.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb283cfbb---gelejuf.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/k87hfvg3mf2c6vuptv7oe9vg60/8901296380.pdfIn PDF document text
    • https://daxitrip.com/basefile/daxitripcom/files/tameribikik.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070d6eea1bcd---bufusipu.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/zokefoto.pdfIn PDF document text
    • https://cargotavio.ru/files/file/56664632969.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_off00012f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 10304 bytes
SHA-256: 977f49c387e5c7581e444e19e102ed0730811aa418a1adb9a33652d1158ec996
font_01_sfnt_off000146d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE5 17820 bytes
SHA-256: 54d96a43ef14115204ccc2f868a4889f6ac62b1399a4ff0bcaf6212d545655d6

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