Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b029c7d6374fc0a…

MALICIOUS

PDF

80.6 KB Created: 2021-08-31 12:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2fb2850617dd843e4a1d8f56d977653e SHA-1: b49d4db1e256049329b7756dc4096d5839e8ac4b SHA-256: 3b029c7d6374fc0ae9e4da35171a3ad7244d0f7d3bdc5ffc214b6fc911ea22d1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.examnotice.in/uploads/files/995401757.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b25c50151e1---50772061453.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/cd9fe92b5700af1512e566f2622a1766/kunowalo.pdfIn PDF document text
    • https://activepymes.com/pub/file/fosamiwifuvepuvusulinas.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc45367af---xeperaderurukorevi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080f510cb913---rowapolikagejofifakepus.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c429923ec9---veturemumamajewidorib.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6e13b8e73---xiridutilebuwa.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/zibinawarixopodigoseziw.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9a20dq1ck3criosrb0bpa2jjns/21897826534.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/dadajozerazozomazezebem.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/04iut9b6kodthqeod8p85vth6a/62618943744.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b724e59d1---retemazusen.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/vazukupinabeg.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/40124476585.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7g8i5cojk19ctm34p01dgtlob2/91977308576.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/kusuwexejebumugipawunof.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c244c235a4f---luvabofipoduzitumodixa.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pnakjcmdsj6fhkudh5ptvs5av7/duvoxajobikobi.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruzevoberinojefubarariku.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/minigebok.pdfIn macro / runtime command snippet
    • http://bafiti.com/sklep/userfiles/file/60585612004.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/709118bac7b745fc229b05448f64f345/87918812856.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/uplrj62ejdmb7rat4d34o9pkl6/kenen.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d431db06---rutesafazebevozofupuvo.pdfIn PDF document text
    • http://zaragozalawoIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=after+life+liam+neeson+streamingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011599.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11599 18184 bytes
SHA-256: 6fe1e49a72a045ba2d537700bdc5b87ee6f4a0238b01bf62dac6a2c89f899831
font_00_sfnt_off0000b996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 10536 bytes
SHA-256: 92fc1286dcb92416c390a60e65d2222bee0c5422efd65e6421a389321d9c75e8
font_01_sfnt_off0000d19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16884 bytes
SHA-256: 57368bfdac447a6b16e6704032d3d9996dac6f614f0c89b6f6d184d25b517d48

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